I would go for digital TV. Personally, a reverse camera is just a gimick. You don't really need one, unless you're a poor driver. Your car has PDC. If the car comes with reverse camera, great. If not, I wouldn't bother fitting one.
Of course, if you still wish to install one, you can fit a line-in splitter, which is switchable. These are available at Maplins or any good audio shop. You can mount the switch at the front of the car, or set up a control unit to detect source, and switch automatically.
I'm installing DVD and digital TV to mine, and both remote eyes will be removed from the PCB's, and hidden at the front within remote range. This is assuming the units I buy don't have extendable remote eyes. If I need to install more than two AV sources, I'll install a splitter.
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