You don't see too many used units on the market, but if you're patient I would suggest a Dynaco tubed CDP. My Dynaco CDV-2 works great with my Senn 600's, and the two tubes glowing in the window on the front of the Dynaco look cool. I suspect you could pick up a CDV-2 for around $400
Best CD player for headphone setup
I am putting together a headphone system for my home office and am looking for suggestions for a CD player that would complement the other two components in the setup, a Headroom Max headphone amplifier and a pair of Sennheiser HD600 headphones. Some listening might also be done with my Grado SR225. My budget for a used player is $1000 +/- $250 (i.e. $750-$1250), but would prefer to stay towards the lower end. For reference, I listen to a lot of acoustic music, bluegrass, small combo and solo jazz, and some electric, early fusion, modern "jambands". Your thoughts would be sincerely appreciated, since it's been some time since I shopped for CD player in this price range.