Try HeadRoom. Here's the link that you might find useful Micro Line. I am running a slightly different set-up on one of their earlier amps, and I can run everything by battery for portable use, with the Sony CD Walkman D-NE920 [has optical toslink output].
I would also recommend going with the Senn. 650's rather than the 600's. Contact me if you need any advise, I've been trying different cables and batteries....working with this system for about 9 months, so I can give you some tips!
I would also recommend going with the Senn. 650's rather than the 600's. Contact me if you need any advise, I've been trying different cables and batteries....working with this system for about 9 months, so I can give you some tips!