Some ideas for any of you thinking of video recording your rides.
What once was the 5MP Hero3 White, which sold for $200, looks now to be the Hero HD and sells for $130.
The 11.9 megapixel Sony AS20 Black, which sold for $200, is selling for $170.
I forgot why I chose GoPro over the Sony, but mine are the Hero3 (http://www.sierrasportbike.com/smf/index.php?topic=4334.msg41486#msg41486) White version 5MP, now HD. The Hero3's built-in stereo microphone is quite realistic in its audio capture. Not sure about the Sony. That may have been why I made the choice I did. I think the Sony's case has to be drilled for better sound reproduction.
And comparison of similar ones:
https://www.youtube.com/watch?v=5G0M87f_sWU (https://www.youtube.com/watch?v=5G0M87f_sWU#t=0h1m38s)