JaZZ
Headphoneus Supremus
I can honestly imagine people being content powering an hd800 with an iphone, since music nowadays has such little dynamic range.
A rockboxed Clip Zip works best lol
I can confirm from own experience that that doesn't apply. Even with FiiO players the HD 800 doesn't sound very good. High-impedance headphones are a bad match with most portable devices. Apart from that the HD 800 is an easy load – for stationary amps.
I just wish Sennheiser's new electrostat be available separately (highly doubt it) and could be driven by a Stax amp. But even then it would be unaffordable for most of us.