I have three different cameras with two of them, GoPro 3 Black and Contour Roam, suitable for outside the car. The GoPro is the better camera overall, but the Roam I feel is excellent for outside the car because of it's streamlined profile. It also has a nifty feature that allows you to rotate the lens independent of the camera body. I also use a Canon EOS 5DII inside the car, but way too heavy and expensive to use outside the vehicle.
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