Any thoughts on the various action cameras for underwater? I've got an inexpensive (not GoPro) one that I've taken diving. It's just in looping video mode, cutting a new clip every few minutes, and could certainly use additional lighting. If I want stills, I just grab them from a freeze frame.

While I'm starting to get more into diving, I don't want to just throw money at other goodies before I know what they'll do for me.