Just started listening to the Aragon DAC that arrived in the mail today. Feeding it HDCDs from the iMac via Toslink right now to very pleasing effect. As a 19" rack unit, it's not really a viable desktop piece, but here it is crammed in and adding yet another color to my LED rainbow.
Sorry, got no relevant experience to share. Just thought I'd mention that, in that sort of speaker vein, you could also look at Tekton Design for some other options.
Some more that struck my ears today.
XTC -- "Senses Working Overtime", "Love On A Farmboy's Wages", "Mayor Of Simpleton"
Echo & The Bunnymen -- "My Kingdom" (Really, the whole flip side of Ocean Rain is pretty much perfect.)
I don't use the HF-2s very often, because I'm well acclimated to the HD800s. But, every so often, something really just doesn't sound right out of the Senns. Tonight it was the AF Gold of "Morrison Hotel". Much better on Grados. Glad I have them.