I have two of the Emo amps...(A800 and A500) 2+ yrs no issues. I also have 3 Outlaw M2200 mono blocks same ownership length...no issues. I would go Outlaw or Monolith. This is just a feel thing, not something I know for a fact, but Emo's rep with the upper echelon amps seems to be slipping.
I ask this question of all 7 ch surround prospects...how do you plan to source your movie content? Buy/rent blu ray/DVDs, or stream from Netflix, etc. I ask this because if you intend to stream the majority of your movie content...understand it's primarily a 5.1 market out there right now and on the mainstream level I don't know if that will change much in the coming years.
If you don't mind renting or buying physical media and you have the room depth for it...7.2.4 all the way.
Good luck with it and let us know how it turns out.