My two cents seem to be in line with Ray's. I have m60s, qs8s, vp150, and an audiosource sub (200 watts, boomy, far from ideal. I got it for $40 from someone in college who was moving and couldn't bring it along.) I personally plan on upgrading my reciever, dvd player, tv, and my sub, before I buy rear speakers. (Although I will buy a reciever that can support 7.1 when I upgrade it.) The m60s reproduce the upper bass region very nicely, but you can't rely on them to rattle your shelves like a sub can do.
