My hubby's friend has a DriftHD
http://driftinnovation.com/ for his 1/4 mile turbo civic. The audio is shit, but there's a $15 external mic which is fairly decent. The battery life is about 90 minutes in 1080, 3 hours in 720. It has a rotatable lens on the front so you can mount it at different angles. Also, there's an LCD screen on it so you can proof your shot. Nice little unit. No waterproof and no lens cap for the fisheye as far as I know. It was $250cdn with a suction cup car mount and helmet and goggles mounts.
http://youtu.be/piqRM6zR2io