I'll start off with nothing but negativity:

I need two cameras, one mounted to the right rear corner and one in the center. The right rear since it seems that invariably a monstrous pick-up or SUV is parked next to me when I'm backing out. The only thing I can do (and have to imagine that this goes for everyone else here) is back out really slowly and pause as my car eventually sticks out behind the monster. Then ever so slowly continue backing out.

The theory is that if there is someone coming from my right side they'll realize I'm blind in that corner. So far it has worked, but I want to be able to back out normally.

I'd also like one for straight back, but the right rear corner is the most important.

And while I'm not looking forward to hiding the wire, from what I've read that is the best solution to not having vertical lines on the image.

I do not want to drill anything in the interior, especially into the dash. I want a decent sized image but not a huge mirror - though that seems to be the best solution.

Not a clue how two back-up cameras could be made to work.

I do not want the back-up cameras on at all times, only in reverse.

I won't say that cost is no object, but I'll definitely pop a decent amount if I can get what I want.