O2 is cheap enough but doesn't do the HD800 justice and won't pair well. Might as well get a SA5000, 940/1840 or T1 and pocket the difference. Sure some people like the HD800 sound w/ cheaper gear, even a laptop HO but you aren't remotely hearing what they can do at that point so why bother.
It's just I have a chance to get the hd800 in a trade which probably won't be available to me later so I'm going to pick them up now then worry about a higher end amp/dac after. I was just looking for something decent to use in the mean time.
EDIT: Lucky me... I'm going to a meet with people bringing the beta22, mkVI+ and some other nice amps which I will hopefully get to try with the HD800 if I get them in time.
Edited by GL1TCH3D - 7/17/12 at 11:57am