You've probably got one now, but I bought a DogCam bullet camera for £90 last year after an aggressive lorry driver tried to punch me (wasn't fun), so sunk money into the camera and it's done me proud since.
It records in 720p, has two rear covers, one fully waterproof and the other not (allows sound).
The sound cover is pants if you're talking to someone, but I tend to just leave the waterproof one on (yes, I am lazy).
I believe DogCam have done a newer version of this camera, allowing it to automatically store over previous data, which is handy, as I don't always remember to remove stuff (unless there's been something concerning).
But the charge on it is pretty good for my commute, 90 minute battery, charges via mini USB and away I go again.
Hope this helps.