I'm thinking of buying a GoPro but can't figure which one to get. There's the black model, the hero model, the hero 4 model - there's a lot of models. I want to use it in cold weather while bear hunting but can't figure out which one to get. For that matter, It's even a little difficult to figure out which one is the most up-to-date model. Not that I need a model with all the bells and whistles. Is there any size memory card that can handle at least 8 hours of recording? Anybody got any experience with these? Thanks in advance.