Help me build my new media room!

[Sylin]

We're in the process of building a new home (9-12 months to completion, so I've got some time), and I am finally getting a dedicated media room. I'd like to invest between $10k-$15k in it, and will need a wall-mountable TV, new speakers, sub, receiver, etc. I do have some questions and concerns, tho.

I am torn between 5.1 or a 7.1 speaker setup. I have room for either. I'm mostly curious about how the dynamics work when a 5.1 soundtrack plays through speakers positioned for 7.1? I can wall-mount or floor-stand any speaker, or have the option of having them built in to the walls if I'd like.

I've considered the Sony STR-DA5300ES as a receiver... maybe a Denon. Thoughts?

Also, power conditioner: yes or no?

I'll be hooking up a Tivo Series 3 for HDTV. A PS3 for gaming. But if Sony doesn't release a DTS-MA patch for the PS3 by then, then I'll also add maybe a Panny BD50 player.

Lastly, I'm debating a 52" XBR5 for the TV, or a projector, or potentially both, since the kids will be watching TV in here, too, and the projector might not be necessary or even practical during the daytime. Anyone run both?

Are there larger TV's that would still fit in my budget?

PS... Forgot to mention that we are having the walls and floor sound-proofed in this room. I am not sure what the builder uses, but I have plenty of time to customize since we're still months away from frame-out.

Thanks!