I suggest the SVC-200. About $160 from Amazon. Used to be cheaper on eBay but apparently people found out it's good and now Amazon is about the cheapest place to find it in the US.
It's small and light and mounts up against a helmet pretty well. I actually have a mount for it that I designed and 3D printed myself, PM me if you want one.
It also takes standard Nokia batteries, I bought two spares AND an AC charger for $8. it's nice to just pop in a new battery every day or two, whatever your schedule is.
I've had about 6 cams now including a GoPro, and the SVC200 is the first one that didn't piss me off in some way.
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Work: the 8 hours that separates bike rides.