"Well, I guess that I could use the pre-out and get a Crown 402 amp, and use that to drive the M80's, leaving the rest of the receiver to drive the other channels, that might be a good option, or get a good 2 channel amp, and use that to drive the M80's."
If you want the M80s then go for it. My M60s are great, but they do harden up a little and get a little crowded sounding at super-high volumes. I reckon the M80s are much better at those levels. If saving $300 ain't important to you - and you don't mind buying a decent 2 channel amp to drive the M80s should the Pioneer be unable to do so - then go for the M80s.
It may be wise to look into visiting an Axiom owner for a demo, but since you like B&Ws you'll probably like these speakers, as well.
Good luck.
