So you need a set of 5 speakers, one sub and an avr for the $5k...how about an optical disc player? You already have the tv/projection setup? What size room is this for? Mix of movies/music? What speakers do you have now if any, what speakers do you tend to like?
Might look around accessories4less.com for avrs and even speaker sets, subs they don't have much of usually so would suggest the sub specialists like SVS, Rythmik, Hsu, Power Sound Audio, Seaton, JTR, etc.