Mint SD Duet with ART Duetta Mod:
Low-noise oscillator, powered by its own low-noise regulator. Output transformer coupled, with a 75 ohm BNC . Customer linear PSU.

Picture from
http://www.analogresearch-tech.com Duetta thread. My PSU is slightly larger.
Unit only plays 16/44.1 files. Outstanding SQ and value.
Includes Receiver, remote/charger, stock PSU and customer linear PSU.
You'll need to provide your own BNC digital cable and a power cord for the linear PSU(standard IEC).
Asking $650. I'll pay for shipping to the USA.
Moving PC playback to a Mac with Pat's Legato USB to SPDIF converter.