I currently have a hero 1, hero 3 white, hero 3 silver, and hero 4 black. All of them work perfectly. I would say there is no need for you to get a hero 4 black or even silver unless you work with video a lot and need up to date professional video. I recommend you pick up a hero 3 silver or black. Very good quality and they are around 3 years old now so you could find one pretty cheap. I use a shoelace tied to my helmet and have never lost a camera even though it has fallen off a few times. PM me if you have any more questions!
Colorado // Kayaking // Skiing // Film