Your post leaves me wondering...
Why aren't any of the Hsu Research subs that I am seriously considering on your list?
I am most likely going with the VTF-15h or dual VTF2 mk4's.
My system is 100% for music production.
I did also strongly consider the Hsu models, and in my mind they sat in the middle and I got to the point where it was Rythmik or PSA (I mean at some point you come up with reasons to reduce options or you'll never commit to just one). I did recommend a friend buy a Hsu sub, in 2012, before I knew of PSA. And he did get the VTF3-mk4 I believe. In my small brain I've convinced myself I'm getting a VTF-15H-level product in a different, perhaps not as nice, covering for a couple bucks less. I like the tweakability in the Rythmik and Hsu models, but color me lucky, or color me astute, I've not had issues integrating my older a/d/s ported sub (with nary the tweakability of Hsu or Rythmik) in a bunch of rooms, huge and medium sized. I also find that once I get something dialed in, I don't really want to mess with it, and this is just me, but just knowing there are things you can tweak can pull you into a tweakability coma. Anyone ever go into one of these, ever? Bueller? Anyone? And it's fun to play, and then you often end up right back at the original settings. Granted having those options to dial in a sub initially are a plus especially given you have restrictions on where you can place a sub in the room (tweakable options are never a bad thing but they're there to aid in dialing the sub in). Coupling my room, where I can put the sub just about anywhere, and my good dialing-in experience with an older, well-performing sub did not entice me to go with a new model that offered lots of tweakability.
Here's my thinking, you may need to put on your bang-for-the-buck hat on first to swallow this whole.....
If you're going to get into the home theater/audio subwoofer market these days you best come out firing on all cylinders (no pun intended) from the gitgo, else you can end up a short-lived blip in the annals of ID subwoofer sales history. To wit, a couple other ID sub companies have gone missing over the past year, very likeable, highly respected products, too.
Even though I hardly feel as if I'm taking any risks with PSA, I'm not averse to taking risks, and I'm also quite discerning, and critically demanding of any product I may buy. I'll be sure to share my experiences once I get the XV15.
I do believe any reputable ID sub maker offers great bang for the buck, and very likely anything you buy, over $600, from Hsu, PSA, or Rythmik, as long as you're not an output-whore or need to place a sub in a stadium size space, will satisfy 90% of the people in the market. Depends on knowing your needs and expectations, and getting manufacturers to tell you which products will satisfy you once you've clearly defined those needs for them. All the ID sub makers are really good at this, but PSA was head and shoulders above the others in making me comfortable with their product. Your experiences may vary!