Hi Badga,

"Best" is a bit subjective - some people want best video quality, some want best sound, some want the smallest size. So everyone will have different ideas of "best".
But anyway, have you looked at the range of Drift Innovation helmet action-cams yet?
http://www.actioncameras.co.uk/brands/drift/cameras

See http://www.xt660.com/showthread.php?t=20260 for my XTX video shot using a Drift X170.

There's a selection of different models and kits available to suit your pocket from �129.99 to �350 upwards. Reasonably compact, very easy-to-use and intuitive user interface, a built-in colour display and a wireless remote stop/start. You could even pick up an older model second-hand on eBay at bargain price if cost is a major factor.