you dont need a screen, just use a thick bed sheet, works just as good lol
if i were setting up a home theatre i would have a motorized screen comming down from the celing for movies mated to a dlp projector, the projector is hooked up to the computer and dvd player. for tv i would have an array of 4-27" viewsonic LCD TV's (only 1000 CDN each). for home theatre it would be an 8ch 1200w with paradigm speakers all around. for fun i would have 4 12" car subs 500W RMS each powered by 4 500W RMS amps hooked up to the reciever for low level input via RCA active splitter.