@rjduncan truly a no brainer. the CS3.7 stand out. However, I was very very surprised how great the MCS1 turned out to be. Note that I only have one for my center channel and it was an amazing replacement for the SCS3 it replaced.
It's been a while since I've used the 2.3s for music. they're wasted as my rear channels right now. If I had the space in my office, I'd probably invest in another AMP and move these there.