I'd go with M60s for music listening. A sub like the 500 doesn't show it's real capabilities unless you're watching movies or, as mentioned, listening to pipe organ music. The 60's will give you all the bass you need for your musical preferences with less of a neighbor-annoyance factor.
Or, if your budget can allow...
Consider the M80s for their edge in detail and slightly lower bass if you're going subwoofer-less.
I think that's the first time I've ever recommended M80's, but I think that's what I'd do for a two-channel music system that doesn't involve pipe organs...
