It's something I'll primarily use for music, used with speakers and a pair of Grado 225's. I'd prefer USB because I'd like to use it between both my laptop and desktop. Something in the 200 or less range would be good, here are a few I've been looking at:
EMU 0202 or 0404
Total Bithead or Total Airhead
Edirol UA-1EX
I don't know much about these so if anyone has any experience with them it would be great. Also, I'm sure there are some I'm missing so any other recommendations would be great.
Help picking out a sound card 
Linear Mode
