Dave,
Do you have any idea on what the battery life is like.
Mark
there are lots of HD helmet cameras now.
-Gopro HD
-ContourHD
-Drift HD170
-Oregon HD
the prices are getting lower due to competition.
there are also other china made helmet cam but quality is not that good.
try to check on helmet cam forum
http://www.helmetcameraforum.com
I have both the Gopro HD and ContourHD and each has pros and cons, but the GoProHD is hands downs better video quality over all. The ContourHD is better accessibility but recent firmware changes to the GoProHD improved it.
The GoProHD package is waterproof but the ContourHD is 'weather resistant' which means don't get it wet.. The ContourHD is easier to switch on recording on the fly and pause.. re-start recording. The GoProHD is now capable of one touch start recording but its not as easy as the other one. But if you're entering a situation you need to record throughout, this is not a problem.
Hands down, the GoProHD has much better video quality than the ContourHD. I've had to send three of them back before I got one that was good enough. Most focusing issues.
As for vibrations affecting video quality? I mount mine on motorcycle fenders, frames and helmets and I don't see any waves, rolling shutter effects or weirdness.
Best bang for the buck out of the box would be the GoProHD. It also has the optional LCD monitor kit which makes it super cool to set up the camera and review your footage without the need of a PC / laptop etc.
Fun stuff