+1 for the MHDT Labs Orchid. Especially after I rolled the stock tube, it got even better (and it started out sounding very good).
Don't forget the considerable goodness a quality DDC can bring to the DAC party. As soon as I put my new Matrix Audio X-SPDIF 2 in-line between the computer & the Orchid (using a quality silver coax cable), that already fine sound got even better.