The significantly better helmet cameras all seem to be £300-500, which i think may be too much, unless you can find another use for them. Having done a little research, the most popular three are:
The GoPro HD Hero which looks like a toy, but gives great quality.
The Contour HD or GPS (GPS is the latest and best model) which looks the aesthetically pleasing and boasts lasers to help you align the camera.
The V.I.O. POV.HD which has the disadvantage of having a wire from the camera to a head unit. Also £500. Although it has a screen on the head unit and you can edit video on that too. Its also got the best battery life and uses AA batteries. The biggest advantage is the remote which you can mount anywhere and press to "tag" your video. The tag will then select an amount of video you;ve preset and save you trawling through the whole thing to find the part you want in post production. For example, a car cuts you up, so you press the tag button, this then tags a 5 minute section backward from when you pressed the button. This also saves card space.
The GoPro HD Hero which looks like a toy, but gives great quality.
The Contour HD or GPS (GPS is the latest and best model) which looks the aesthetically pleasing and boasts lasers to help you align the camera.
The V.I.O. POV.HD which has the disadvantage of having a wire from the camera to a head unit. Also £500. Although it has a screen on the head unit and you can edit video on that too. Its also got the best battery life and uses AA batteries. The biggest advantage is the remote which you can mount anywhere and press to "tag" your video. The tag will then select an amount of video you;ve preset and save you trawling through the whole thing to find the part you want in post production. For example, a car cuts you up, so you press the tag button, this then tags a 5 minute section backward from when you pressed the button. This also saves card space.