Welcome Karl.
The main differences between the M22's and the M3's, aside from the cabinet and driver configurations are the M22 uses the 5 1/4" dual woofers vs the single 6 1/2" of the M3. The M3 has a bit of a bass hump around 100-150hz vs the more linear freq response of the M22....some users prefer the M3 for it's slight boost in the bass, others don't. The M22 is more typical of the 'Axiom sound' I would say, often said to sound very much like the M80s with the addition of a sub.
Any receiver around 90-100watts should be fine at moderately loud listening levels.
I would try various placements of the speakers after you get them and see where they sound best to you.
