I'm using the M60s with a Yamaha RXV1400 receiver, and have been very happy with the sound. It's an HT setup with a VP150 and QS8s and M2s for 7.1 surround, and an SVS 20-39 PCI cylinder sub.

The sound is fantastic - no complaints at all. I've especially been enjoying more and more SACD and DVDA surround recordings. I just picked up Steely Dan's Gaucho and it bowled me over.

The current version of the Yamaha is the RXV1600 (recently released) which has HDMI switching, so I may get that for a couple of HDMI sources that I currently have to switch at the display. I'll definitely stay with the Yamaha, though.