Zilla,
I am using the Audio Magic Sorcerer digital coax. Works great! I want to upgrade my IC's to Sorcerer or even Illusions.
No power conditioner, first dedicated lines but the money now I think has to go for an amp. The Audio points have been too revealing of the Nad's character. I would say that they "tighten up" the sound. Hard to describe. I only have them under the Dac and between the speakers and stands. I think the sorbothane blurred the sound and posed a phony "bloom" of sorts. Now the Nad is clean, powerful and even more boring than it was before. Funny, I too thought the system was starting to sound pretty good.
So, a new amp. I'm thinking to try tubes for the first time as well. Oh, if you have young kids that may bump your speakers, forget the cones there. They do make the speakers tippy! No problem here.
And so it goes. Scott