I've been doing a little research too, and the Cordas HA-1 amp by Meier audio seems to be highly recommended on the headphone pages: headwize.com and headfi.com. It comes with variable crossfeed and is solid state. Good luck.
Need Advice: Which Headphone Amp?
Okay, so I recently purchased a pair of Sennheiser HD 600 headphones and now need a headphone amp. Can you give me recommendations? I have thought of the Antique Sound Labs, David Berning, Rega and Headroom. Are any of these are others good matches for the Sennheiser's. Thanks alot