FYI Contour is out of business.
I've been through several cameras, including the Contour Roam, the Sony ActionCam, and the GoPro Hero3 White. I now use a pair of RD32II cams, $125 each on eBay (mostly shipped from China, expect a 2 week delivery time).
Mounting:
I've been through several iterations of mounting on the bike, but it's just too much vibration and it destroys the image quality. The RD32II is VERY light and two of them is not that much weight.