Plasma beating blacks with no burn-in risks....its a no brainer!
True, a Plasma may not run 550w all the time, but neither do the low voltage LED's on the back of the set, after all when the picture is mostly black thats because 0w is going to the LEDs in that section giving a true black, not the almost blacks on most Plasmas. What I do know is when ever I go near the new LED LCD the heat given out is a fraction of what the Plasma used to pump out. Probably due to its normal operational power usage of 240w, half of the 550w you mentioned.
I'm not denying a Kuro is a good TV, I've watched films on my friends 1yr old 50" Kuro (what he has in his "cinema room" becuase he doesn't want to ruin his £1200 TV by watching Sky with all its pesky logos), but I know that the plain-bow effect is still visible on that TV, even at its lowest light levels it will still chomp on almost the full 240w the LEDs pump out on an all white screen, and the best bit is an actual measured everyday non-dynamic contrast ratio of at least 500,000:1 (measured by users on AVForums with correct diagnostic equipment) and ZERO chance of burn-in at those levels. Current Plasmas can come close without ghosting being a risk, their not only in the same league, its not even the same sport. My plams, even with pixel orbiting on, would burn a channel logo / sports score in if you watched the same thing for more than an hour - leaving a slightly blurry but still burned in image - never a risk anymore!
Me, I'll watch my LED LCD over a Kuro and day of the week. Its just less fussy for normal TV watching and amazing for films, an amazing all-rounder.