I Need Some Help On A Couple Items.. I'm Making My First Home Theater.. the room is going to be 12' wide x 17' long . I going next saturday to buy the electronics.. infocus screenplay 4805 projector onkyo tx-sr702 a/v recivier onkyo dvcp-702 dvd player infinity primus 7.1 speaker package direct tv hd dvr recivier all thx wires know if any one sees anything wrong let me know but my concern is the THX thing i would like to know that the thx select would be good enough for my room . do i need the thx dvd player and speakers or is the recivier going to be the main part for THX. i dont want to spend the extra money (thousands) for the speakers and the dvd player if i will not or barely know the difference .. also i plan on building a false wall for the projector screen .. is it worth buying a screen or painting the wall ? and the project it says it will convert everything to 480 what is that = to i want a nce clear picture when watching a hd program or a dvd will t be good or great picture .. thank you guys for all your future help !!!!!!!!