helmet cams and bike cams

Can anyone recommend a reasonably priced cam, for use on bike. I am after something that has a reasonable picture quality and good battery life. It also needs to be capable of filming for a reasonable duration. Above all else it must be easy to use for a complete technophobic like me. I was thinking of the base level Gopro.Ideally don't want to pay more than £100 and £50 would be better still!
Cheers all.

 

Thanks littleade. Did you get it online?

 

That looks good. To be honest I have spent a couple of hours scouring youtube, Fleabay and amazon and have now ended up even more confused. The base GoPro looks suitable but I am not sure whether some of the other cheaper "unbranded" cams wouldn't offer comparable or better performance for a fraction of the price. The other one I am considering is the Drift Stealth 2 which you can pick up now for under £100.
I'll see what some of the vloggers are using on youtube