Here it comes, the most advanced and also smallest quadcopter from DJI so far IMO. DJI Mavic is so small that it almost fits in your pocket. You can basically brint the DJI Mavic Pro with you everywhere.
GoPro Hero5 is now waterproof and does not need a separate housing like Hero4 did. Also, Hero5 has an image stabiliser which works only when recording at 1080P resolution.
GoPro HERO4 black editions is the successor of the HERO3+ model and has some cool new features. HERO4 is able to shoot 4K video at 30fps rate, which is quite important.
Phantom 4 is the latest quadcopter from DJI. It has Auto takeoff and auto return home. Phantom 4 can capture 4K ultra HD video at 30 fps. The f/2.8 lens with a broad field of view delivers crisp, super clear images.
Parrot AR.Drone Elite edition is a very affordable and cabable drone. The price is under 300 $ and you get pretty good drone with it.
Here you can find the latest reviews and tests of the popular and not so popular action cameras. Hope these reviews will help you to find the best option for you.