Your requirement: "must hold up to low frequency vibration" = MiniDV tape or flash memory. No hard disc drive... if you stay with traditional camcorders.
Depending on your budget, you may want to use a camcorder (with AV-in) or other digital recording device and a helmet-cam to capture the video. Like something from Viosport...
So, I am looking for a relatively inexpensive camcorder that I can mount on motorcycle for video footage. My intentions are to capture some video footage of me and my friends on the close circuit tracks.
Needless to say that the camcoder must hold up to low frequency vibration. Any help is welcome.