If you're listening to a lot of music having 5 M2s would probably be perfect, but for movies the QS4s and QS8s are supposed to make a big difference in the "seamlessness" of the surround effects.
I second the vote for 3 M2s up front and QS4s or 8s as surrounds. Maybe even go for QS8s to get a driver match with the M2s.
The only reason for going with a different center IMO would be if you needed the extra magnetic shielding. My center sits on top of a CRT and I got some noticeable fringing until I replaced the M2 center with a VP100.
Welcome to the M2 club !!
M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8
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