Your OEM mounted camera is probably the BEST option you can use for a rear view camera, considering it's flush mounted and basically hidden.
ANY aftermarket camera you get will mount out in the open somehow, like mount to the license plate, or under the bumper or spoiler. This leaves the camera open to vandalism, and theft.
I have installed an OEM camera, however it was after the fact. Mine wasn't installed from the factory. I did install it in the factory position. One thing you should know is that the camera is intended to run on 6vDC, supplied from the nav radio. However, I've had mine running on the full 13.8vDC for the last several years with no problems. Oh, and I don't have mine powered just when I put it in reverse, mine's powered all the time the vehicle is on so I can select the camera to view whenever I want.
I have used it with OEM nav units E7006, E7007, E7008, and aftermarket units Kenwood DDX-8019, Alpine IVA-W505, and Kenwood DNX-9960 with great results. The only other camera I would even consider is the Kenwood CMOS-300, but I would only use that for a front-view camera to be used in conjunction with the rear view camera. :guitar3: