I'm a fan of the JDS Labs ODAC. It's inexpensive and sounds super. There has been a lot written about the ODAC and there are many happy owners. I do dislike the very small cases many USB DACS are packaged in, including the stock ODAC. I took the liberty to mount an ODAC circuit board in a larger enclosure and wire her up with some VALAB brand, teflon insulated, silver plated copper wire. Gold plated RCA connectors for the outputs. $159 includes the stock JDS Labs USB cord.