Clarion
Alpine
Eclipse

^^ Id recommend those brands. Alpine has the best looks in my opinion. All the models of each that compete in the same price range have pretty much the same features and specs. For $200 - $250 you can get a pretty nice head unit with remote, mp3, XM or Sirius ready, and preamp outputs, CD-R playing capability, removable face plate, and maybe a tilting face. Go out and look at some and see what you like.