This Christmas you are spoiled for choice as the number of action cameras in the market swells. To help you evaluate the many cameras with many different features, I recommend this review by http://www.actioncameras.co.uk .
Looking at the review it is easy to pick out higher resolution and video frame rate models like the Go Pro Hero 3+ Black edition. Battery life is critical. The performances listed are not those that you may expect during a HAB flight and do not include performance with a battery bacpac. The GPS features are nice extras available to the Garmin and Contour cameras though it should be remembered that they only operate below the 18km height limit, so may be inoperative for half of the flight.