IMO, it doesn't matter which POV camera you pick as long as you know how to use it and you know how to make a good video with it.
I have old version of GoPro 1080p, not the Hero2. In my case what's the use of me getting the new version of any camera you've mentioned above, if I do not know how to make a good video, do not know how to do sick editing, etc. I think I'm kind of tired to see so many POV Mtb video taken by each of camera with helmet, handlebar or chesty mount plus crappy music.
Sorry, I'm not trying to be sarcastic about it. Part of it, I was talking about myself too. My lack of editing skill, my lack of experting the camera features, etc. Please don't feel offended. It's just me, IMO...I'll get a good camera until I really know what I'm doing with it.
This guy below made a good movie to watch with a pocket camera by SONY. It's a Sony HX9V. I do not know about others tho but I like this kind of Mtb video. The results is neat, no shaky footage like I took with chesty on GoPro. I think I'm gonna start to do this.
[video=youtube;NU6LCkB7mxs]http://www.youtube.com/watch?v=eOUq4Z6R7xI[/video]
[video=youtube;qNcUsgFKsPg]http://www.youtube.com/watch?v=qNcUsgFKsPg[/video]
But hey, "It's your Money...use it when you need it!"
Enjoy your new camera! :beer: