I am thinking of getting a 4.8is instead of the new e70 and I am trying to do my homework.

If I get a car that has navi and parking distance control (beeping I assume), will I be able to properly retrofit a rear view camera? Who makes the best/coolest camera out there?

Any chance on getting a camera that has the steering angle and obstacle colors etc like that found on the new/upcoming e70?

ALSO, can the navigation system be upgraded?

Thanks