I have a pair of M22s for L & R with a VP160 CC (that I upgraded from a VP100).

Because there is so much more content mixed into the center channel as contrasted to several years ago, all you really need is a VP160. It is excellent in that role & digs deeper than most CC speakers out there. Furthermore, its driver placement on the front baffle is closer to ideal than the VP150 (or so they say!).

My Audyssey hears both the M22s & VP 160 at 40 Hz in my room so I have mid-bass in spades. The previous VP100 was heard at 80 or 90 Hz if I remember correctly.

The M22s are no slouches & are just fine as L & Rs as long as you have a quality sub or two to tie it all together. I don't think that M60s would give you any more performance but a VP160 definitely would...

TAM