Re:mobile audio gurus...
 

Actually, if you want to go cheap, decks with aux inputs are kinda hard to find. You can get a deck that is disc changer compatible (most are). there's a plug in the back where you're supposed to plug the disc changer into. then you can get a plug that turns it into an rca cable, (typical red and white stereo/audio wire) and plug that to your laptop. Make sure you get an expensive ass sound card

Re:mobile audio gurus...
 

yeah, def the aux input deck or one with changer adapter input. or if you want to add some adjustability, audiocontrol makes a 1/2 din eq with aux input and a master volume control. called a 4.1 last time i checked.

Ben

Re:mobile audio gurus...
 

Or, if you get an amp to power all your speakers, you can run teh sound into teh amp, but thats more costly...