An even less expensive option, if you are running a Mac, is to use an AirportExpress module (about $120) which has an optical output that streams raw data and bypasses the DAC (you'll need a toslink cable). You can stream your music from your computer via either an Airport card or other wireless device, or via an ethernet cord directly to the AirportExpress. The optical output of the AE runs to your DAC and VIOLA! If you are looking for an inexpensive way to experiment and see if it suits you, that might be an alternative worth considering.
Marco