I just got a lg c9 55 tv and its awesome. I still have my 8500 Samsung plasma in the living room and I find the oled an upgrade in many ways. The alpha 9 processor is great and the gsync is insane for smooth gaming with very low lag. 2.1 hdmi will future proof your tv and ps5 is rumored to be 2.1. Say hello to 4K gaming @120 hrz.
C9 77....awesome, go for it!