75W is plenty to power the M22's - especially at close range. I'd go with the M22's as long as space isn't an issue - that will allow for larger room placement in the future if you need to. Both sound very similar to each other so you can't go wrong either way. As you can see from my sig I have M22's L&R mated with an M2 center, makes for a great front sound stage.

Dan
On-Wall M5HP LCR, QS8 & EP500 in 7.1