Unless you want to spend an absolute fortune on a tiny screen and don't have it connected up to a PC most of the time Plasma is by far the best tech around. Proper black levels, better colour and generally better all round than LCD.
Burn in? I though that went out about 10 years ago, certainly our old Panasonic plasma never had a problem with it, and it was used a huge amount to play games as well as films/TV. The only time I have heard it about new screens is the cheap makes.
SED I think is never really going to be mainstream, it may get overtaken by OLED and really only be used for professional apps (Have they started manufacturing them yet?).
So in 5 years it may be OLED, but at the moment for large screen goodness there is really only one option.