Bought a used '08 Aveo last fall. It still has the original AM/FM radio which includes, no CD player, no AUX (audio-in) jack. I don't care about CDs one way or another but the main criteria is that it have an AUX jack for iPod / Mp3 player. At first I was thinking about taking the radio out and attempting to figure out how to connect a cable into it for audio-in. Although I know it's doable, I thought it would be simpler just to replace the whole unit.

There are quite a few OEM units for sale on Ebay that have both CD player and AUX jack.

My question:

Would I be better off (sound-wise and price-wise) getting an aftermarket unit or going with one of the used OEM ones?

My main criteria at the moment is not to spend much on this project. (up to $100) But of course if the sound is going to be much better with an aftermarket unit then I'd consider going with aftermarket instead.

Thanks in advance for any advice/help.