What would you guys do?...

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Excellent! When you start put together your mod thread. Take pictures on the way. This does two things for the Aveo community
1) It shows others we do love and care for our cars
2) It allows the community to celebrate your own progress to learn and help on the way.

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If you go looking at a new stereo, strongly consider A double DIN Android System.
andriod 2 din stero | eBay

Unless you have golden ears and put in tons of sound damping. Loud and clear and good enough. So I look for function
1) GPS
2) Radio
3) Review Camera
4) SD card for your own MP3 Tunes

I would get one that would work offline and have the maps preloaded. I would avoid the 3G ones unless you can put multiple devices on your CELL data plan.