I'm not really sure what problem you are having, is it because the yammy had issues driving the 4ohm M80's? Anyway, Denon or HK will have no problems with the 4ohm load. I have the Denon 2805 and in either Stereo, Direct, or Pure Direct modes music sounds dynomite. You would be also fiine with your other options, however, I'm not familiar with seperates as much, so the other folks will have to update you. Another option is looking at Outlaw Audio, very nice stuff and they sell direct like Axiom.
Randy
