i use an AFI 3 axis gimbal (first time i've used it, only just got it) and a git2 camera, i also have a gopro (3 black) but the git2 is much better so i don't use it anymore.
you won't go wrong with the gopro stuff you have got coming but it is damn expensive due to the name on the side of it....as you are probably well aware
. the bitrate of the hero5 is good so your videos will be a little sharper for sure. there may also be mileage in recording in 4k and edit down to 1080 to get it even sharper. i have not played with that yet as youtube crushes quality anyway and the rendering time for 4k is substantially more.
post up some video when you have it, i'm sure you will love the results.