I power my M80s with an HK AVR630 and they sound fantastic. Although I have had my receiver in the shop twice to fix some factory defects. Both times covered by the warranty, so other than the inconvenience of bringing it into the shop, I've been thrilled with the receiver.

Add to that the fact that it can set different crossovers for each speaker group, I love it.

Mine is a little outdated in terms of lacking HDMI inputs, but this won't be an issue for me until I finally upgrade to HD-DVD/Bluray.

Shag