In your price range, the KS8000 is the best one to get. The Vizio P Series also performs well.
http://www.rtings.com/tv/reviews/by-...eo-gaming/best
There's no details about how the PS4 software update is gonna actually put out HDR without having HDMI 2.0a but for the Xbox One S, you're gonna need a TV that supports HDR10.