When you say "sound quality", do you mean linear response? Accuracy? Perhaps some other owners can chime in here, but an M22 with sub (properly situated) can sound similar to the M80 sound profile. If you do a search on the board you may be able to find the thread.
How large is your room? I think that would be the determining factor based on loudness levels, where the M60 would have an advantage. If it's a moderately sized room, the M22 + sub would be a good fit, especially if you are running 90% movies/tv
