If your viewing distance is around 4 to 5 meters, I suggest go for the 75" and audition the TCL 75c2 and compare it with the Sony 75x8500e
If viewing distance is below 4 meters then 65" it is. Check out the LG 65c7 Oled TV, Sony 65x9000e, Samsung 65QLeds and TCL 65x3