Most car units now include Aux ports for mp3 players, and some decent ones will run you about $80 or so. That you don't have to worry about the cd drive going out on ya. Try Crutchfield here http://www.crutchfield.com/g_300/Car-Receivers.html?tp=5684 just input your make and model of car.
Plus, cassettes are the betamax of CD's lol. I still have my original Def Leppard: Hysteria album on tape.