What are the seating arrangements (furniture) going to be ?
EDIT -- if you're going 7.1 then I think M3 surrounds would probably be fine, with the caveat that I have essentially no 7.1 experience
You're going to be essentially mounting the surrounds in corners at a 45 degree angle, and the ceiling is going to bounce the sound away from the listener, so this is probably one of the few environments where QS's may not be preferable as surrounds.
Do talk to Axiom before you order though... they see more "interesting rooms" than we do.
