Can't decide between GoPro Hero 4 Black and yet-to-be-released Sony FDR-X1000V. Both shoot 4K (ultra HD), GoPro 3 oz, Sony 4 oz. Both can shoot 1080p at 120 fps. Sony has GPS, Steady Shot built in. GoPro image stabilization in post-production, no GPS. Sony $50 cheaper with Reward bucks...