car pc

I'm going to instal a Revosys X500.1 Intel Atom 2DIN Car PC and I'm looking for a good USB Sound Card with RCA outputs. Preferably one with front, rear and sub. I've been looking online but haven't really found what I'm looking for. Any ideas on where to look? Thanks in advance, Mike

New,Car PC Computer ,with 3G/DVb-T/GPS/Bluetooth/mp5/online radio: 7" Car PC supports HEAD REST Working Independently Configration: Screen: 7inch 16:9 digital high definition monitor,pix: 800*600 System: Microsoft® Win7® XP CPU: INTEL ATOM N270,1.66GHz Motherboard: Intel 915GM Chipset...