I think the real question here, Bob, is how big your room is and how loud are you going to play them? I use my M80s in a 20x19 room (with open doorways to the kitchen and hallway), and I run them on an H/K 525, which is a 75Wpc 7.1 receiver. However, I rarely exceed 80dB, more often I'm in the 70dB range. I've never had the receiver enter protect, and it's never sounded strained.
On the other hand, buying a receiver without pre-outs doesn't make a lot of sense to me. It's always nice to have the option to upgrade.
BTW, you don't need to worry about the dual tweeters/dual mids thing. It's a design decision on the part of Axiom to improve power handling (Axiom tests them with 1kW amps or something absurd like that), and I can't say I've ever noticed anything untoward in the treble from my M80s.
