Hi T.,
That's sort of what I was expecting room wise. I'm assuming a railing on the open end of the room. What isn't clear to me is will the screen drop down from the open end (which could be cool) which seems like where your misses wants it, on is it a back wall (side?), or be against the outside wall? (A drawing or sketch, photo would be helpful. Maybe something off the Real Estate listing? Or later when you get time.) Is the ceiling flat?
Shipping is free for any SVS product shipped within the continental USA (CONUS). (Not Canada either as we are considered "International"
) For shipping outside of CONUS (e.g., AK, HI, etc.) you need to contact their Customer Service for a customized quote to your location. But hold off until you drill down more. Other folks here may (will?) chime in with there opinions of speakers. (I personally love my HSU CCB-8s but speakers are a very personal choice. What's good for you may be something completely different.)
Atmos using in-ceiling speakers is well supported here (but bouncing off the ceiling speakers are not). Going for a 5.2.x is a reasonable approach. Personally, given the size of the Loft, I suspect a 5.2.2 would be more than enough, and be cost effective. Positioning of the Subs will be a bit of a challenge but going wireless here may save you some grief. They shouldn't have to be too large (as Subs go) so they will be quite movable. Again SVS does have a good fit here. (By the way I have 4 identical Klipsch Subs (on 3 different systems), but would probably go to SVS or HSU if I was to buy something new these days. The SVS App makes them very appealing.)
For your mains, and your price point, I'd look to SVS Ultras bookshelf across the front at ear level, with possibly the SVS Primes for the rear. Some folks say Ultras in the rear are really overkill, and not cost effective. With multiple Subs in a HT setup, the need for floor standing speakers wouldn't make sense either in your loft.
I'd pre-wire everything before I purchase anything. A lot of On-Line speaker OEMS will let you test out their gear for a while (up to 45 days for some) in your home => so you will really know what it sounds like before you have to decide if you want to keep them. (They usually pay some of the freight, but I don't know for Alaska.) Of course you will see what's available locally, and try to listen at those locations, but it won't be the same until you get them set-up at home.
I hope this is helpful.