I have a gopro I got around the holidays from woot for $135, and I have a contour roam I got at the same time from amazon for $90. I also have an oregon scientific sd. the quality of the gopro and the contour are very similar, gopro may have a little better color. the contour is much better for mounting on a helmet, because of the size and it mounts on its side. also it has a large slide switch on top, forward is on/record, back is off. very easy to use on the fly even with gloves on. the drawback to the roam is that the mounts are more expensive. it does have a tripod mount on the bottom. big plus there for me, you can make your own mounts. the gopro mounts are so much cheaper and have more variations, I bought a mount for the roam that allows me to use it with the gopro mounts. If you wanted to use the contour in a harsh wet environment, they recommend you buy the waterproof case. I would use the Gopro.
the last two times that woot has had a wootoff, they have had the gopro hero hd for $135, but they went in less than ten minutes.