Spock:
I use the NAD C540 and C370. They are fine sounding with the M80s, but could be a bit bright on the top end (I blame this on the amplifier section of the integrated). You can improve the sound of the amp quite a bit by replacing the factory jumpers that connects the pre-pro with proper interconnects (but that probably represents an additional outlay of a hundred dollars).
I tried M22s with the combo and it sounded very poor -- the speakers sounded small, weak and thin. A tube amp maybe a better solution in this case. However, if you are buying NAD beware of the QC problems.
Good luck!
