A new helmet camera is going to be released by Contour very soon, it is the ContourGPS, which seems to be the Contour 1080p with added GPS functionality. Seems to be priced at £370 in the UK but only $350 in the US.
http://www.actioncameras.co.uk/contour-gps-hd
http://www.actioncameras.co.uk/contour-gps-hd