Answers: A better OEM radio. You are not going to find any aftermarket radio that will reprogram a GM knob fob, and security settings. The best you might be capable of do is still be able to use the factory steering pedals controls with an aftermarket element. If you have to own an aftermarket head component, I think your best bet would be to remote mount your OEM stereo within the trunk, so you can have the reprogramming functionality, but enjoy the opening contained by the dash for your GPS / mp3 player. Otherwise, I would recommend getting a standalone GPS system, and connecting your mp3 player to your OEM stereo through the auxiliary input, or through an FM modulator. Crutchfield have an adapter that is will connect to a factory GM stereo, and you can attach an Ipod to it. Check that out. And you would still be beneath the 1000 dollars you would spend on a GPS / mp3 headunit.
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