I own a 2004 chevrolet classic with the base am/fm/single cd player. I keep receiving an error message when I try to play cd's and the stereo spits them out. I've tried cleaning the cd player several times but the error persists. I am considering replacing the stereo with an aftermarket from either best buy or circuit city. I wanted to know if a special harness had to be purchased in order to install an aftermarket stereo, or if anyone had some suggestions on which stereo's to purchase and how much I'm looking at spending. I called my local dealership and they said that to replace the delco stereo with a new one would cost around $265.00 plus labor (which I think is rediculous). Any information or help would be greatly appreciated since I know very little about cars.