Contours are nice, because as wafflecakee said, the lens that turns. Replays are nice because of their size. Both are easy to use, and both give you a great picture.
A new camera is the Sony Action camera. There are two models, one is $200, the other is $270 or so. Both are the same but for one thing, that being that the more expensive one has wi-fi capabilities, so you can use your iTouch, iPhone, or Android device to see what it is looking at, turn it on and off, and wirelessly transfer your images from the camera to the other device.
One of the very cool things about the Sony is that it films in 720p at 30, 60, or 120 frames per second. So if you want that really cool slow motion footage, then 120 is going to be better than 60.