The reason I ask what you will be using it for is to determine which set of features you need. If you're going to be using it for simpler activities, don't go all out for a Black edition with a 60fps, 1080p cam (all HERO3's are 1080p, anyways). The reason the Black Edition is so expensive is because of the crazy quality it has, and if you're using it for a more simple basis I wouldn't worry about the difference. The Silver or even White is perfectly fine for you. The main difference between these two is the white's camera has a 5 megapixels with 3fps burst while the silver is 11 megapixels with a 10 fps burst -- is that worth $100 to you?
Also note that their newest line of cameras, the HERO3+ (plus) are only smaller in size and lighter in weight. As of now, the Black Edition for both Hero3 and Hero3+ are only a few dollars different in terms of price, so go for the plus! And now that the HERO4's are out, check the prices of previous versions as they'll be dropping slowly. Unless of course you want the newest of the new, check out their HERO4!
GoPros can be used as standalone cameras, but thanks to a great mobile app, they also pair perfectly with Android and iOS devices, allowing you to add more functionality and versatility. Using built-in Wi-Fi and Bluetooth, users gain full control over their GoPro camera and can even display a live feed of what’s being captured right on their mobile device.
GoPro HERO8 Black
But it’s not only the lens lending credit to the impressive video GoPros capture. GoPro’s new Hero6 Black captures 4K video at 60 frames per second (fps) and Full HD 1080 at up to 240 fps. This isn’t just impressive for such a small camera — few interchangeable lens models have achieved 4K/60, with the $2,000 Panasonic Lumix GH5 being the first. As for still photography, the Hero6 shoots 12-megapixel images with features such as WDR (wide-dynamic range, GoPro’s lingo for high-dynamic range or HDR) and RAW file capture. And a new image processor — a first for GoPro cameras — helps improve performance and image stabilization. GoPro has managed to put all of this into a camera that’s not much larger than most DSLR batteries.
gopro underwater camera