Thanks again for your help, everyone. I am leaning toward slowly obtaining pieces of the new Kef Q series. I think I'll start with the just the receiver and a pair of floor-standers. Then I'll add the sub (SVS PB-2000, probably), center, and bookshelves, in that order. I still have a few questions:
1) I am leaning toward the Q750s for the floor-standing speakers over the Q950s. From what I understand, the main benefit of the Q950s would be better bass. With the SVS PB-2000, do you guys think the Q750s will be sufficient?
2) Will the Denon X3300 work with that whole setup, or will I need another amp?
3) Does anyone know how to figure out where I can demo the new Kef Q series?
4) Does anyone have experience with this site?
https://designeraudiovideo.com/ They seem to have the Kef Q series considerably cheaper than anywhere else (950s for $775 and 750s for $620). I am always suspicious of deals, haha. If the site's legit, though, I'll probably buy from them.
Thanks again, everyone!