If you want to pursue software upsampling and other DSPs, go with a USB to SPDIF converter or a DAC with built-in USB input.
Otherwise, you can save yourself a lot of trouble to go with Squeezebox or Soundbridge (avoid M1001) and use their digital output to the DAC of your choice.
See http://www.enjoythemusic.com/magazine/equipment/1205/slimdevices_squeezebox.htm
Otherwise, you can save yourself a lot of trouble to go with Squeezebox or Soundbridge (avoid M1001) and use their digital output to the DAC of your choice.
See http://www.enjoythemusic.com/magazine/equipment/1205/slimdevices_squeezebox.htm