Dave: My very first question in these forums many moons ago was a concern about whether or not the M60s could sound good...delicate even...at softer volumes. I was assured that they sound great at lower volumes as well as cranked up, and now that I own a pair, can assure you of the same.
If you're not getting a sub, I would go for the M60s easy!
::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab :::::::