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?
What GoPros are compatible with the app?
under water camera
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!
Does GoPro have any competition?
Inexpensive: Between $200 and $300, you’ll find GoPro cameras that are perfect for most people. There are great 1080p models and some decent 4K models in this price range, and if you’re willing to look at last-generation models, you’ll find a lot to like here. If you absolutely need bleeding-edge features like spherical capture or live streaming, you’ll need to look at more expensive models, but if you just want an action camera that can take gorgeous video and go just about anywhere, you don’t need to spend more than $300.
Do you need a filter for GoPro underwater?
All GoPro cameras cover the basics of action cameras: they’re portable, waterproof, and rugged enough to tag along on any outdoor adventure, and they also take high-quality video. Beyond that, however, there are some big differences across the product line, including some features that are worth paying extra for. Here are the GoPro camera capabilities to consider keeping on your short list.