I'm using a denon 3806 with my M80's and it can drive them to painful levels without any help. I never really take it past 0db unless I want to show off how loud the speakers can go with no distortion. At +10 I can't stand to be in the room for more than a few minutes and I LOVE things loud .

Granted my room is on the small side, but I would try it by itself before purchasing any seperate amps and see how it suits you.