Ricoh WG-M2 4k@100mps...about half price of Go Pro Black
Doesn't have a LED screen but can pump out 60 fps/1080p for $119 ozzy dora from Kogan. (they were about $69 USD when dollar was strong)
https://www.kogan.com/au/buy/xiaomi-yi-action-camera-white/
https://www.engadget.com/2015/04/29/xiaomi-yi-camera-versus-gopro-hero/
yes, ive had GP 2 &3 silvers....and currently use an elcheapo too....
the ricoh does 4K and that definition is exceptional even on a 1080p display
Other well priced cams in the same league as GP.
https://www.hobbyking.com/hobbyking/store/__1662__1376__Photography_Action_Cams-Action_Cameras.html
Note: prices show cheaper once signed up as a HK member.
The YI Technology (https://yitechnology.com/) 4k action camera would surely fit your budget. Available on different online store as well.
This little action cam will be available late April and may just jump to the top of the tree in this category?
Announced a couple of weeks ago, to come in 2 colurs...Shark Bait Silver and Orange
A variable angle of view up to 204 degrees,20m depth rated,shock proof @2m,and will tolerate down to 14 farenheit(but I wont be testing below around 18 celcius) 7different video effects,built in Wi Fi and free app
4K@30fps.... bitrate 100Mbps 1080@60fps 720@
8mp stills in bursts of 8fps
1.5inch LCD
A few standard mounts but some adapters that are compatible with lots of the GP mounts
Some other excellent features
https://pentaxrumors.com/2016/02/22/ricoh-wg-m2-action-camera-with-4k-vi…
US$$$$ around 300, so 400 A$ i'll guess retail, but the deals will come