I went with the 6600 but had problems with it right out of the box: triggered protection circuit after 15 minutes and shut down. I ended up with the McIntosh C2300 with great EAT tubes and an Mcintosh MC402 amp that the guys at Audioclassics benched at a solid 448 watts per channel. There's a warm slow sound to the amp which I like most of the time, and at other times years for the punch and vitality of the Sanders Magtech SS amp which I was using for a while. Any one have experience with McIntosh MC402 with the Dyn Confidence 1's?
