Only issue to remember about the LG (not sure on the others if its same issue), but that if you are sitting with bright light directly behind you (e.g a door/window), and its close to behind you, you'll get reflections off the LG panel.
If it's not an issue, go the 55" LG .. there's really no contest there. 200Hz TRUE, 6 step upscaling, Netflix/Stan/FreeviewPlus via the simply brilliant WebOS.
Add in that the LG 4K IPS panels look absolutely stunning.
I've got the non HDR 4K model and it's brilliant for gaming on.
On either of those TVs, its post christmas so retailers will be wanting to do a deal. I'd try and low ball them.. See if you can get it for $1400 with 3 year warranty thrown in, or $1300 with standard warranty. It should be doable if they want your business and other places (e.g Harveys) have the TV at a similar price.
Else if Harveys have it, go in there and say they can have the sale if they do it for $1300 neat.
I love the more direct approach of dealing with sales people in such stores. They get one chance and then I'm out.