PC as Source

Right,

I am currently using 3 sources for my cans ATM - PC, iPod and PSP :ducks:

What I'm after is a USB input Can-amp to bypass the somewhat dodgy on board s/card on my laptop. DIY would be preferable coz I already have a great little aluminium case for it. But also with stereo input so i can use the iPod as well :ducks again: ;D

Any suggesions, volunteers ? ;D