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dude you have already been in M&A asking for the "ski film quality" cameras. and to answer your questions, those cameras are all going to be way out of your price range, and if you have to ask for high quality cameras you aren't going to know how to use them like they should be used anyway.
and yes, gopros are perfect for follow cams, they are cheap, shoot in HD, super light, and virtually indestructible. now i feel like you have no idea what you are doing so if you are worried about it, try out handy dandy google and search for gopro videos and you will realize their potential. there are like a million for you to watch and decide if they are good quality to you or not. just look around. the internet wont bite you!
/end mini rant...hope this helps