In the last 2 years I upgraded my speakers 3 times and my sub twice. I now run dual 15h in a 9.2 setup and I don't see myself upgrading for a very long time. I am very happy with Hsu and I'm sure you will be too. To get anything comparable to the 15h you are going to spend a lot more and the difference will be marginal at best unless you want to try your hand at DIY. You say you are 95% certain that you want the 15h so you must have been reading around and it sounds like it fits your budget, go for it! My space is twice that so in your room it will literally "bring the house down" lol!
Edit* if you don't mind a little cosmetic damage call Hsu and see if they have a B or C stock to save some more cash. My second 15h was a C-stock and its still just as awesome and where I have it no one will ever see the small damage. I was planning on repairing it because I do similar work for a living, but when I got it, it was really no big deal so I left it like it was.
Edit* if you don't mind a little cosmetic damage call Hsu and see if they have a B or C stock to save some more cash. My second 15h was a C-stock and its still just as awesome and where I have it no one will ever see the small damage. I was planning on repairing it because I do similar work for a living, but when I got it, it was really no big deal so I left it like it was.

























