I have a GoPro and Mobius cam. If you don't want to break the bank get a RunCam II, it is a Mobius knockoff that is doing VERY well and has some great features and records quite well. It is also smaller than the GoPro so the battery life isn't as great but it will record when plugged in.

This is a good vendor to get one from.

http://www.getfpv.com/electronics/hd-cameras/runcam-2.html 

And this is another forum I hang out at and there is some pretty good reviews on it.

http://fpvlab.com/forums/showthread.php?44859-RunCam-2-Video-Review-amp-Comparison-to-Foxeer-amp-RunCam-1