Thanks for the input! (Feel free to keep it coming.
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As far as the wiring goes, the room is already wired for 5.1 Surround. However, I'm not sure that the cables are necessarily all that high quality. (More precisely, I'm pretty sure they're not since they were whatever the builder decided to put in - I didn't pick them. I just haven't checked them yet.) How much difference would it make in my overall sound quality if I were to run high quality speaker wires instead of the standard (i.e. cheap) ones that are there now?
If I'm looking at a 120" diagonal screen at 16:9, is that screen too big for that room? I want to get the big movie experience, but somebody told me that I wouldn't get a good picture quality at that size. (My impression was that with a good projector like the BenQ 8700 that wouldn't be a problem, but... I don't know. Any thoughts?)
I saw pictures on here somewhere of somebody's theater that had fiber optic "stars" in the ceiling. Anybody have any idea where to find those and how hard they are to put in? It seems like it would be a nice effect. (I sent that person an email from this site, but I think I neglected to give my email address and I can't find them anymore.
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I'm also thinking of covering my front wall, or at least the screen, with a motorized drapery for the theater look and to protect my screen. Any suggestions for that project?
(Correction: Room is already wired for 7.1 Surround.)
Thanks again!