I'm still trying to decide, but so far its coming down to exactly what you all probably thought it would - the M3s have the lower bass I wanted, but lack the upper mids, which of course the M2s excel at. I want to see if I can EQ the M3s to have a little more upper mids. I want the bass drum of the M3s and the snare of the M2s. I would put the M2s upside-down on top of the M3's, wire them in parallel, and call it a day 
M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8
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