Suggestion
I definitely agree with Sheep with the breaker idea.
When I moved into my new home the whole basement was on one breaker. Now it's broken up into about 7-8 breakers, one of which is the home theatre system.
1) Make sure the paneling goes. Bad for sound.
2) Any wiring you can do behind the walls in coduit is a good thing.
3) Make sure you have emough outlets. You can never have enough.
4) You should choose carpeting for your flooring for a better sound.
5) If you're setting up a projector, make sure you have enough room between the screen and the projector for display. Make sure there's enough head room also so you don't hit your head on the projector if this is the way you're going.
That's all I can think of right now.
Good luck on your project.
Ciao
Joe