Anthem and Sunfire are excellent choices. Parasound is ok, but personally, I consider the Outlaw amps a better choice than Parasounds for the M80's. I had the pleasure of using an A23 when I first got my M60's, and while it did sound good, it added a little "tinny" sound on the top end. I also tried it on my Martin Logan Ascents and it seemed to do a good job of driving those, but again a little tinny on the top end, but it was much more noticable on the Axiom's.
If you are looking for one amp to drive all seven speakers, I suggest the B&K Reference 200.7 amp. We (the A/V retail company I use to work for) used one in out Martin Logan theater demo room to drive two Prodigy fronts, a Theater center, and Ascent surrounds with ease. That thing was on at least 12 hours a day and in a cabinet with minimal space. The M80's wouldn't be a problem for that amp at all. Good luck!
