I really want a GoPro but am waiting till the Hero 5 comes out. Slow motion 4k would be amazing.
Check out the cobra dash cams. The one I have can be set to work as an action cam
I use a garmin virb xe for mine it's pretty much the same as a go pro but I happen to like the gmetrix overlays I can add in with it as it records everything, speed ,elevation,g's, pitch,roll,route .... and able to overly the ones I want on video or leave them off entirely..