Were you using the Plasma as a monitor or second screen/TV? If monitor, how have you avoided burn-in? I had an older plasma with a big square burned in, but I got it cheap because of that.
I've got the LG 55 OLED that does 1440 @ 120Hz (Gsync) and I really like it because I can't hardly read small monitors with bad eyesight, so I am ok it's not full 4k @ 120 (can do 4k 60Hz). I am slightly concerned about burn-in and that an LCD would last longer, but this is my first run with a TV as monitor and enjoying it so far. I do get mad at programs that don't allow me to move the HUD around, change the background and icon positions frequently, and set the screen saver at 2 minutes.