What is your budget for your amps?

I would recommend getting a Krell Kav 250a/3 and a 250a

These are the amps that I wound up deciding on. 250W at 8ohms and 500W at 4 ohms. In my opinion this is one of the best deals you can get, granted you will have to get some pre-owned units, I don't know how you feel about buying pre-owned.

I would also say, to use the 2 channel for the m80's and the 3 channel for the center and surrounds.