Take Jason's advice and save up for the M80s. I, like Jason, have heard both and find them to sound very detailed. Unlike Jason however, I find that even with a sub, the M22s sound thin.
At your house I did find them thin, in my own environment they sound pretty darn good. I think it is your room causing some issues with them, possibly it is just too open for them or it was just our placement of them at your house.
Rob, you could trade in the M3s and get the M60 or M80s, I know we have been pushing the M80s but if you really want that next step up, you have to go floor stander,IMO. You seem to really like the M3s, I would say the M60s sound is somewhere between the M3s and M80s.
