One option is to install a new stereo head unit that allows a rearview camera to be hooked up to it. These usually are the more expensive DVD playing headunits. Most are also double din sized which cannot be installed in the Crossfire without reconfiguring the center console. However, JVC does have a single din DVD head unit that has a smallish 3.5" screen and Pioneer and Alpine have single din units that have a hidden LCD screens that pop out.

I have also seen a rearview mirror that has a small video screen that can also be hooked up to a rearview camera. Its big and bulky and would probably look like crap, especially with our small windshields.

Other than the mirrors mentioned in the previous post, thats about it.