All I can say is, buy a known product with good support. Don't buy the cheap stuff.
The top three in my books, in order, would be GoPro HD, VIO POV 1.5 and Contour HD.
The HD cams have the obvious HD advantage, the VIO POV has a microphone. Though, the GoPro HD is soon coming out with a wireless video wristwatch to act as a remote/screen and also a wireless microphone in the later months.
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