That crystal LCD that Sony showed off at CES would make the most sense as far as technical aspects go. If they ever make it to market they would likely be crazy expensive. It works fairly similar to OLED and should really be what we call an LED tv (curse marketing for calling led backlight lcd, led tvs), but unlike how OLED can potentially come down in price because of materials used and manufacturing techniques, the crystal LCD's are going to be more expensive in raw materials and harder to make.
I don't see OLED making its way to computer monitors any time soon though. Currently they have issues with displaying white. And there is far more white space on a computer monitor than on a TV. From what I've read about LG's 55inch though they might have fixed this by adding a white diode.
The huge issue is going to be burn in though. Not only does each diode burn out individually, they also burn out at a different rate per color. If i remember right blue was burning out twice as fast as the other colors. I'm not sure if LG has found a fix for this, but if not it is going to be hard to have a monitor with icons and task bars that don't move burning in.
If the 4k tv's take off it might be the best thing for the pc market. Unless you are a huge blade runner fan though there isn't any content out there for them. But getting some 4000 lines of resolution on a lcd instead of the current max at 2560 that is common to find is probably the best that we are going to see in the pc monitor market for awhile.