Looking for a good 40-43" 4k TV

[PCFan]

I'm considering buying a 40-43" (preferably a 40") 4k TV even though I have no plans on buying UHD Blu-rays or a 4k blu-ray player this year but I want some future proof for at least a couple of year. I would prefer a 40" over a 43" TV due to my sitting distance but if a certain 43" TV is much better than what's available in any 40" TV then I will consider a 43" TV. I don't have a TV in my bedroom right now and I'm using my 23" 1080p IPS monitor as a TV that sits on my computer desk. My maximum budget is $700 but I would prefer to spend no more than $500 on a TV. I narrowed it down to 3 choices I'm considering and here they are:

http://www.bestbuy.com/site/searchpa...=960&keys=keys

http://www.bestbuy.com/site/samsung-...&skuId=5069100

http://www.bestbuy.com/site/lg-43-cl...&skuId=4973347

Features I want:

low input lag for gaming
HDR
24p support
good contrast ratios
good response times
good viewing angles
option to turn off dynamic contrast
no dynamic backlight dimming or at least the option to turn it off