Give PC audio a try with this little Fubar2 USB Dac. This DAC works with Windows, Mac, or Linux....plug and play. I used it in a desktop system which is no longer needed. Fantastic DAC for the $. Includes Firestone Supplier power supply. Good review here:
Fubar2 DACBoth DAC and PS are in very nice shape, no scratches, dent's or dings.
$175 for both