Are you talking 2.1 or 2.0, ie are you planning to have a sub as well as the M80s ? If no sub, my first thought would definitely be to pick up a decent used stereo receiver and a big honkin' 2 channel power amp or monoblocks, even if I didn't really need the power.

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8