I did consider the gopro for the chest mount option, but I got a great deal on a nearly new Contour, which swung it. Extra mounts for it look a little pricey. I really like the rotating lens on the front of the contour (180 deg) which allows you to mount the camera in the most convenient place, then use the 2 internal lasers to rotate the front lens to level up the picture. I have mine mounted on the angled top right side of my urge enduromatic, which puts it below the top of my head line, but central enough to avoid balance issues.
Those front Mounts look much better from a height point of view, but having spent many years in the RAF with Night Vision Goggles fixed on the front of my flying helmet, I am very wary of rotational weight on my head.
My mate has just purchased a GoPro for our Alps trip on Thursday, so if you can wait a few days, we can compare and get back to you?