I just got a USB DAC that I'm satisfied with and I'm selling my USB-S/PDIF converter. I'll put this on Audiogon this week if no one here is interested. Short of the Alpha converter, these are excellent performers when coupled with a good power supply, or battery power supply. I sold my power supply to a buddy who also has an Evo, and many members here have the skills to build one. It really makes a huge difference.
C.A. thread about converter shootout:
http://www.computeraudiophile.com/f6-dac-digital-analog-conversion/15-usb-spdif-converters-shootout-15327/List price about $500.00. Usually sell on Agon for about $300-350. Happy to sell to a member here for $250 and a local sale. No Paypal, etc.