The Atma-sphere M60s (and I'm sure there bigger amps)sound great with my Merlins which are OTL friendly, and the CAT JL2 which sound great on just about any speaker. In SS, the Pass XA30.5 were the best I've heard/owned. The best integreated I've heard were various VACs and the Ars Sonum (with Merlin speakers).
