Thanks everyone for your input. It seems like the GoPro is the most popular. Most of the videos taken on the trails I want to ride are taken with the GoPro. I've used other activity/waterproof cameras in the past, but like the wide angle of these camera. I will keep looking, I'm not in a big hurry right now.

On another note, does anyone know of a good camera mount to would fit the downtube of the frame?