Projector BenQ W1070. IMO the 1k price category is where you want to stay and every few years get the latest and greatest one. You are going to be much happier imo if you do it that way vs spend 3-4k for one now and have to keep it for the next 10 years. (put aside 3-4k if that works better for you)
This site is my go to for projector reviews:
http://www.projectorreviews.com/
As for audio.... If I was buying today. Put your money into the subs and center. The other speakers are not as important. I personally will always have SV Subs in my room and I have been very impressed with it. They also make speakers now too and they get very high marks from reviewers but I have not heard them myself personally. My next speaker upgrade will probably be the Prime Series because they have some of the best built stuff out there but they are just wall mountable and not inwall (wasnt clear in your first post).
http://www.svsound.com/speakers/prime-series
And speaking of the sub go dual.... SVS sells packages and go with the biggest ones you can afford.
Also on the receiver they are all pretty good as long as you stick with a name brand but if you go 2 subs you want a dual output receiver so you don't have to split.