Put the amps on their own dedicated circuit if possible. Hey, if you can swing it, put each amp on their own 20-amp circuit and the rest on a regular 15 amp. However, if you're running subs, you should have the subs on their own circuit as well.
Then again, this is all highly dependent on what SPL's and/or volumes you plan on listening to. Every plan to listen at reference for movies or just really loud for music? Got any bass heavy stuff in mind?