Two good links of interest, that I came across, that will get you closer to acheiving audiophile quality through your computer as source.
http://www.ultraaudio.com/equipment/ayre_qb9.htm
http://www.stereophile.com/digitalprocessors/ayre_acoustics_qb-9_usb_dac/index.html
http://www.ultraaudio.com/equipment/ayre_qb9.htm
http://www.stereophile.com/digitalprocessors/ayre_acoustics_qb-9_usb_dac/index.html