Dan, I have two regular headphone amps. A Creek OBH 11 with an upgraded power supply and a Soha with upgraded buffers. Then a couple of portables. I know about the higher ohm and the need for a dedicated amp.
Cool, my friend just built a SOHA II. He's dealing with some distortion issues right now, but so far he likes it. We'll see what oldschool ends up plugging the 770's into.
I'm considering the Denon AHD2000's. They appear to be highly regarded. Have you heard them Dan (or anyone)?
Yes, I've heard they are very nice closed cans. I almost bought them to try them out. I still might in the near future because of a headphone website project I'm working on. Plenty of opinions over at head fi...go ahead and get lost in them :-)