Are the M60s that much better than the M50s to justify the $180 price difference? Im considering getting the following system (as you may have read in my other thread) in the next couple of weeks:

Harman Kardon AVR-525
Axiom M50ti (or M60ti) Towers
Axiom QS8 Surrounds
Axiom VP150 Center
Hsu VTF-2 Subwoofer

Thanks!