The 8000 has hardware based micro-dimming (last years model only), as opposed to the software based implementation used this year. Black level is improved vs the 7000 but your viewing environment may negate any advantages gained in that area.
The bezel on the 8000 is slightly smaller than the 7000 (clear plastic bezel on 7000, slightly thinner metal bezel on 8000).
Whether these differences are worth the extra to you are a personal choice. I chose the 8000 for the improved micro-dimming and thinner bezel ( I know some prefer the 7000 bezel), both are fantastic sets (especially if you realize the limits of edge lit LCD's).
Edit: sorry, just noticed that you referenced the UE version not the UN model. European version 8000 did not feature the hardware based micro dimming.
"...I'm ready for dream-time Mr. B."