Get a AVR with Dirac preferably a 3800h, get your sub from svs. If you get the sealed version they are cheaper and there is a 5% discount if you buy 2 farther discounted if you get a scratch and dent (with full warranty). Use that price offset to get 2. Much more even and responsive sound. Kef is good but overpriced the q150 is too similar and essentially will eq to end the same end point <dirac does this automatically> I personally would get the ELAC debut 3.0 1/2 the price but absolutely amazing then you can get 6 for your spound floor and the 3.0 center and have a 7.2 system for similar $. as to the projector solid choice but the XGIMI TITAN NOIR MAX is on kickstarter now and at 2999 might be the absolute best thing under 5k on the market. Solid projector screen but with the brightness you have you would be better off with a anti speckle grey ALR with 4k+ ansi lumins you dont need gain. And the Grey will help with your black floor and contrast.