I have the Denon 1602 (70wpc) powering:
VP150
M22ti
M3ti
it is more than enough power with the speakers set at small and with my EP125 sub to fill out the low end.
I like the M3's in the rear, they sound great, and due to placement i absolutely had to get either bookshelf or floorstanders, i don't have the ability to put quadpoles back there.
M22's in the back would be overkill unless you listen to lot's of DVD audio, or other 5-6 channel audio very critically. Even then, the M3's are incredible speakers, so don't worry about them not being good enough.
