Whatever you decide in the end is up to you as far as taking pictures or filming, or writing a journal.
But if you decide to film take a look at the SJ4000 or SJ5000+ action cams.
They were made to be able to use the same accesories as th GoPro for a much lower price (~80-$100). My brother uses them on his race car and is quite pleased. Plenty of reviews and youtube tests to compare to GoPro, and between models.
I have been trying to convince myself not to purchase one
