Hi there! Welcome to the forum. I hope we'll be able to help you make a decision here
First up, you've got a "large" room with a bit over 3000 cubic feet. However, I also see that you have a hallway there as well. It's important to note that the entire open space - everywhere that the air can freely move - is what a subwoofer is going to try and pressurize. So especially when you are saying that you want that tactile, "hit you in the chest" type of bass for movies. That's going to be an important thing to consider and should partially inform your decision.
I want to talk a little bit about your layout options. Are those absolutely the only two options that are available to you? If so, it isn't "ideal", but the option of using the smaller 10 foot x 13 foot portion (the one you've marked as 1040 cubic feet) would make more sense for the simple reason that it would allow you to properly center a nice sized display for the sectional seating and allow you to place your Front Left and Right speakers on either side of the display. If you use the layout in the larger 1800 cubic foot space, with the layout you've shown, your Left Front speaker would basically be in front of your hallway and your Right Front speaker would be jammed into a corner - so that layout isn't what I would pick anyway
I don't know all your limitations in the layout of your furniture, but I'd like to offer one other potential way to arrange things:
if you look at that "top" wall that you've marked as 15 feet across. You could have your sectional facing that top wall. One side of your sectional would run up the "12 feet" wall. The back of the sectional would be along the "7 feet" portion and it would stick out a foot or so past that "7 feet" portion with what I assume is the chaise lounge portion of the sectional, but I don't think that would be too much of a problem. Now your display and front speakers would be on that "15 feet" wall, but you'd be offset to the right side of that room. I don't know if there are windows or something that would prevent this arrangement though. The reason I thought of this layout is because it would allow you to pull your sectional a short distance away from the walls on all sides. You could pull the side section of the sectional some 1-2 feet away from the "12 feet" wall. And pull the back of the sectional some 2-3 feet away from the "7 feet" portion to give you a 9-10 foot viewing distance. The left hand side of the sectional would jut out into the open space by a couple of feet, but you'd still have a very large opening to that "bottom" 1040 cubic foot room and you'd have a portion of the larger "upper" room on the left hand side where you could put additional seating, or bookcases or even an office desk or something. To me, it's just the better acoustical setup (getting the seating a bit away from the walls) and actually gives you a bit more space to work with - almost like having three areas in this open concept space, rather than just two.
Anywho, that out of the way, let's talk subwoofers!
Honestly, at this point, with the budget that you have, I would recommend that you go for one, very high output sub, rather than two, lower output subs. And the reason I'm saying that is because you said that you want that tactile bass - and that takes some good headroom for strong, uncompressed transients. I actually suspect that you have a fair bit more than 3140 cubic feet because of that hallway that likely opens up to even more space down the hall!
Now here's the thing - a pair of SVSound PB12-NSD subs, which are the most capable both in terms of output and extension out of the list that you gave - to me, that's going to be right on the edge of having the sort of output that I would personally want and feel comfortable recommending in this sort of space. So if you're sticking with really wanting two subs and sticking with that candidate list, then easy - go with the two SVSound PB12-NSD subs! The pair of FV12 Rythmiks (as much as I recommend that sub in the $500 price range) won't have as much output. The two Outlaw VTF-2 MK4 won't have the same depth of extension or the output. The pair of eD A2-300 don't have quite the same level of tight control and finesse as the others. So to me, out of that list, it's a pretty easy pick with the SVSound subs.
However, you should double check if that used PB12-NSD you're looking at is the same PB12-NSD as the current model that uses SVSound's new "Sledge" amp, or if it's the "old" PB12-NSD. They're not the same sub. Similar - sure. But the new "Sledge" amp'd version is a different sized box, new driver and new amp. And it honestly is better than the old one - tighter transient response. No more slight hint of overhang that the old one had!
So yeah, just double check that the used PB12-NSD is the current "Sledge" model, cause if not, you wouldn't actually be getting a pair of the same subs.
But if I'm being REALLY honest - with this sort of open space, and for what you described as wanting in your bass experience - I'd feel most comfortable stepping up to a pair of higher output subs. Now, your budget won't really allow for that right now. But you could certainly get one and then add another in the future at some point. To me, it's that word "tactile" that you used. It's trickier than it seems because where that sensation comes from isn't the super deep 20Hz stuff. The super deep stuff gives you the "tingling" sensation, which is also cool. But the "hit you in the chest" stuff is about an octave higher, in the 40Hz range. And what makes it tactile are the transients, which can call for MASSIVE peaks in power and output. It's for a super short burst. It's a super short amount of time. But if you don't have the headroom in the sub for those super short bursts, you miss out on the tactile sensation, so that's where I'm coming at this from.
Adding a second sub doesn't boost your output as much as one might think - unless you co-locate your subs, ie. stack them one on top of the other or put them directly side-by-side. But if you're using two subs in two different locations, you only get about a 3dB increase in output. The bigger reason to do it is to get more even bass response throughout your room, which you say you also want, which is why the ideal would be a pair of higher output subs
But for now, I'd favor using your available funds for one, very high output sub. The VTF-15H is certainly a contender. So too would be the Rythmik FV15HP or the SVSound PB12-Plus or PC12-Plus cylinder version.
In terms of price - and especially if you can pick up the sub from HSU directly and avoid the shipping cost, there's no question that the VTF-15H is your least expensive out of those options. And in terms of tactile output, that baby's got it in spades! I have to be completely honest and say that in MY listening - where I heard the VTF-15H in a professional dubbing stage - the VTF-15H wasn't my absolute favorite out of all the subs that HSU has ever made. I actually wish that they had maybe up'd the price a little bit, used an even higher powered amp and really tuned that box a little lower so that it would be a bit more linear overall and really dig down to 20Hz at the same high output levels as the rest of the frequency response. But I also have to say, I'm picky as hell, play things back at reference levels, and in my own home, almost always wind up EQ'ing down the response of subs below 30Hz because the room gain is enough to boost the super low frequencies!
So I've gotta say - for your particular situation - with the room that you've got, with the budget that you have, and for the kind of experience that you're describing that you want to achieve, the VTF-15H does manage to fit all of those criteria the best, IMO. If you don't have to pay the shipping, you won't have to save up for too long before you can afford a second one! And I can DEFINITELY say that a pair of VTF-15H in that room will absolutely deliver the experience that you're looking for. You most certainly won't be hurting for output or tactile bass
Hope that helps! And please let us know how things go! I think your visit to HSU will be really helpful to you and I don't think you'll be worrying about this recommendation very much after that
