zeuiax,
Axiom not only makes great speaker, these guys are amazing when it comes to customer service. You did the right thing by contacting them to see what they have to say. Before I purcahsed my M60s, I was actually thinking aboout going with M80s. I spoke with Amie, Ian and for quite a while with Alan Loft. Rather than pushing M80s, after finding out what my setup was going to be and what I will be driving them with, they suggested M60s which I bought (in really nice cherry chestnut wood VaSallo series). For surrounds they justified going with QS8s in place of QS4s. I would say the price you are getting for these M80s is really sweet, go for it man. Axiom will always be there to help you with anything you would ever need.
If I had seen this post sooner, I would have offered you my EP350. I sold it for $450. I am buying EP500. Good bass is never a bad thing, is it?