I own a pair of Confidence 5s and use Classe' CAM-350s as amplification. Listened to Pass, Classe' Plinius, ML and others. Didn't like ML, sounded too "dark". Liked Plinius, thought wasn't a good value. Really liked the Pass and Classe', woud have bought the x600 if had the money. Bought classe' as a better value. Based on my experience, I might start w/ the smaller Pass amps, and the new CAM-200 monoblocks from Classe'