I used to follow this thread getting ideas and finally built my theater. At first I was going to use an 11x11 room, but ended up renovating and the room is 21x12.5. My equipment is:
Boston Acoustics VS line, 325C, 260 and 240s in a 7.1 config
I have an SVS PB12 NSD
Onkyo 709 as a pre amp to an Outlaw Audio 7125 amp.
Chairs are Palliser Bullets. Very comfortable for an internet, no test, buy
Visual Apex 120" tension controlled screen
View distance is 14'
A couple of things I learned:
I don't need 3D, just not worth the extra $1800 when I bought it. I can't even recline my seat all the way or it distorts the image.
I didn't need a tension controlled screen. I have 3 Da-Lites at work at they look just as tight with no waves.
All I can say is every time I sit in there and watch anything I just say to myself or my wife, I love this room. I use it for everything, TV, gaming, movies. People who see it say, "I didn't know projectors looked so good.
Thanks to all in this forum and other threads for the ideas.