I have been using a bunch of remote video camers over the years. My most used and successful is a high quality bullet cam attached to a Sony digital
camcorder. It is a bit of a bulky package but has survived all sorts of abuse from in car footage, down the side of a mountain on a bike etc, and it just keeps on ticking. I need a more compact unit so I got an Oragon Scientific ATC cam, not bad for the price, but didn't last...couldn't take the vibration on the race car and image quality was poor at best. I had the same experience with a little Samsung micro camcorder...
I was planning on building a new more compact setup when I came across this
POV 1.5M Motorsports Helmet Video Camera and System | V.I.O. It looks like it will do the trick. It does not have all of the input accessory functions of the Chase Cam or AIM, but is waterproof, 12volt or battery powered and has a good track record. I should have it in a week, just in time for a track test.