A mate of mine is after a USB soundcard, all it needs to do is provide him with a stereo output, to be used with headphones. It is to provide a second soundcard for a laptop with Traktor on it (mixing software), and use the USB soundcard to power some decent headphones so he can monitor etc.

So all it needs is a decent power output, to be stereo, and to sound good. Bus powered if possible.

What is there around?