I realize I'm a little off topic on this thread, but I figured I'd chime in briefly anyway...
I've owned both of the LED versions these sets, and currently own the 8000. The 7000 is a great set. I had the 40" version and the color and clarity were pretty amazing compared to other TVs I had seen. The only negative thing worth noting was the edge lighting was sometimes noticeable in the lower corners of the screen, depending on the content being viewed and the brightness of the room.
There was a mixup with my billing on Amazon and the only way they had to deal with it was to have me return the TV, so when I returned the 7000 I figured I'd go for the 46" 8000 since it had come down in price a little since buying the 7000. The color and clarity look the same, but the edge lighting is substantially improved over the 7000 in pretty much any situation, and especially when viewing in a dark room. For this reason alone, I'd recommend the 8000.
I've always wondered about the difference between the 7000 and 8000 plasma versions of these sets though. A friend of mine has the 8000 plasma and the picture quality is excellent.