OLED obviously, but until those become big enough and affordable enough, my vote goes to the 65" Sony 65HX950 full array LED with local dimming.
Best LED on the market without question. Nothing else comes close.
Plasmas are nice too, but MAKE SURE if you get one of those that it has some form of motion interpolation, unlike the Samsung models. Otherwise, you will be in double image hell whenever you camera pan in non-60FPS games.
I actually play my games on the Sony with Motion Flow enabled despite the slight increase in lag because I just can't stand camera panning judder.
Also plasmas get very hot, have line bleed issues, can buzz, can have color uniformity issues, and a host of other hassles, not to mention image retention when gaming. And of course if your whites to look white on plasma, good luck, because of automatic brightness limiting. Plasmas are dimmer in general.
Trust me, I'm a TV expert, I tried every tech and TV inside my house except OLED so far.