I'm not sure you are going to have a choice in the matter. You'll need at least a Denon, Harmon Kardon or seperate amp to power the M80's. I'm not sure of any other brands that can power them adequately. Maybe the Pioneer Elite series. I'm sure someone else here can chime in if they are using a different receiver other than Denon or HK.

I have your same setup, except for a EP350 sub which powers itself) and I run an HK AVR630.

Shag