If I were you and I wanted to improve the sound of my system, I would put my money towards the speakers before the amplification. I think you'll gain much more from a pair of QS8s or QS4s than having a separate amp for your M3s. My Denon 890 drives my M80s and VP180 to pretty loud levels without any issues.

Bruno
M80s/VP180/QS8s/EP600/AVR-890
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"The problem is choice..."