I have a 15.5' x 33' foot room, I'll loose 2' for placing speakers so 31 feet. Main use will be for movies. What reciever should I buy and budget do I need? 7-2 or 9-2? I don't want to waist $$$ but if there is a noticible difference I'm willing to step up... figured I should find the received before I post on speakers and sub woofers...Main seating will be two rows @ 14' & 18' from sceen behind that will be a bar.Thanks in advance!