Good front/rear car cams?

Can anyone recommend a good set of front/rear car cams? I mostly commute on highways for 1.5 - 2.0 hours at a go, and I'd like to be able to have that record if anything goes weird. But there are so many brands and types out right now that it's just really difficult to sort out what works well and what is an expensive dud.

Anyone using ones they are willing to recommend?