I have a GoPro, Contour and Drift and I prefer the Drift because it has a LCD, Remote, Zoom, and external Mic.
http://driftinnovation.com/hd170-action-camera

I got all three of my cameras from these guys:
https://www.mypov360.com/shop/drift-hd170-helmet-camera/
and the must have accessory is the Pedco Ultra clamp for attaching any camera to your bike.
Sample Video:
http://driftinnovation.com/hd170-action-camera
I got all three of my cameras from these guys:
https://www.mypov360.com/shop/drift-hd170-helmet-camera/
and the must have accessory is the Pedco Ultra clamp for attaching any camera to your bike.
Sample Video: