Radio swap

I have a 2000 V6 with the 6 disc changer in the glove box. What all if any factory radios can be swapped? I'd like the 6 disc in-dash unit but I don't have the Alpine setup. I park the car in a not-so-nice downtown area for work and don't want to spend a bunch of money on an aftermarket radio that will walk off at some point.

Thanks,
P.J.