Around $400? Any websites to browse through? Thanks!

Did a comparison on Crutchfield, came up with three I'd choose from based on overall specs in that price range (300-400). Two Kenwoods and a Clarion P.A. unit made the cut. $329, 329, 399.

There are a BUNCH of websites out there...

Alpine CDA-9812rr is the only one to have.
60w x 4, dedicated sub pre-out, front & rear pre-outs, DAB ready, EQ on board, Aux connection for MP3/iPOD as well as CD changer, and red illumination especially for Audi.