I use the Stereolink 1200 (www.stereolink.com) which connects to the USB port on my laptop. It costs $150. The DAC's are pretty decent. I don't have much to compare to, but it sure beats the stock soundcards that come in PC's these days.
I actually learned about this on audiogon a couple of years ago.
I actually learned about this on audiogon a couple of years ago.