I've got the M22s, so you know I can't live without a sub. But what I really, really like is the "S-Direct" mode on my Marantz (direct source...I don't know what the other manufacturers call theirs). I just wish it didn't bypass the sub when you engage that mode. I was fiddling with it on a few CDs this afternoon, and the difference is pretty dramatic. I understand that the idea is to bypass the distance & level settings and just give the pure signal to the speakers, but it would be much nicer if it could somehow recognize the sub.

M22ti mains, EP175 sub, VP150 center, QS4 surrounds