Jim - thanks so much for the help and quick responses.
The room is about 22' wide and 13' deep (narrow) with the HT in the middle of the 22' width. The 92" projection screen is about 12' from the viewer on the couch in the center of the wide room. Of course, the towers are on either side of the screen, with the center channel below the screen. The rears are behind the couch about 18" and in the ceiling. The wides are about 10-12' apart, and in the ceiling.
1) The Fry's Infinities - do you know which ones those are? Their link doesn't work and I'd like to do some more research on those.
2) With two kids under the age of two who will grow up fast, the best place for the sub will be under the coffee table next to the couch. Is this location OK and will that have any barring on the decision for what sub to get?
3) The center channel - I've read that this shouldn't go on the floor. Sounds like the best thing will be to build or get a stand for it and get it as high off the ground as I can while staying just below the screen. Am I on the right track there?
One more thing to think about - I do have the wiring for the LCR's already in the wall around the screen. So, if I'm going to scrap the Polk R-50's that I have, then I might just put those LCRs in the wall as well...the basement is framed with drywall, but the mudding isn't totally done yet, so this would be the best time to make this move if I'm going to. That being said, any thoughts on in-wall LCR's?