What is the best DAC to buy used in the $500 range


I am looking for suggestions on the best sounding used DAC in the range of $500 used. I have checked the archives but didn't find any useful information. Does anyone have any suggestions on what to look for? Thanks for the interest.
128x128pugstub
the $500 dACk (Version 2) that was just listed a few hours ago probably has little or no competition at that price. I do not know the seller or his particular DAC but I know many people who have had great success with the earlier versions.
I can tell from having the Birdland Audio Lite dac from the time it came out til now that this dac is great.If you want a smooth sounding dac with lots of detail this is it.Do your self a favor and read the reviews.
I was in the same situation 6 months ago and my research lead me to the Bel Canto DAC rev 1.1 - the .1 is an power supply upgrade from the original. The BC DAC retails for 1300.00 and they can be acquired on A'gon used for 500-600 dollars. Do a google seach a read the reviews -the BC is an excellent performer

NOTE....which ever DAC you settle on be sure to pair it with a high performance digital cable. When I initially purchased my DAC, I bought a well reviewed budget digital cable and at the time though it was a good performer...that was before I auditioned a Transparent digial reference cable -the difference was night and day. I never would have imagined that swapping out 1 cable would make such a difference, but it does, at least with my setup the diferrence was audible.

Good luck!
please disregard the subject line of my previous post "rotel rb-1080 hmmm" looks like the line was copied from a previous post. The line should have read Bel Canto Dac 1.1...thks