Hi all, a friend of mine just stacked it big time on his bike, broken collarbone, three ribs, punctured lung and a shattered pelvis

Currently in hospital waiting for operation. He also suffered concussion which means he can't remember much of the crash (plus he is up to the eyeballs on horse tranquilisers because of the pain

)
This got me thinking about getting a helmet cam for my daily bike commute in case anything similar happens to me. I have been biking for over 4 years and can count the number of near misses on a single hand, but as my wife says, I don't want to get that phone call one day.
Can anyone recommend a helmet mounted camera? Budget is $100, plenty of them on ebay, but not sure of their quality etc. Need something that's waterproof (Melbourne), lightweight, able to record at least 30 mins (time of a single trip) and hopefully crash proof.
Thanks

Bo