I've just got the LG 42LM640T for £599. All I can say is WOW!
The picture quality is stunning. I always thought my full HD LCD TV was great quality til I saw my brothers 100hz Finlux LED TV, but this just shits on both from a HUGE height. Firstly the 400 MCI frame rate is jaw dropping. Pop the blueray of Dark Knight Rises and I was blown away. Then I turned the 3D on and it just works effortlessly. I set it to cinema 3D and it's not the stuff coming out at you that impresses so much, but the depth. I can't recommend it enough.
I went for LG as I really can't see why anyone would pay the ridiculous prices for Active glasses when ou can grab passive ones cheaply, or use the ones from the cinema. The apps on it are great. Streaming in SuperHD on Netflix is magic, and I've already got it playing the US Netflix app. Best £600 I've spent in a long time.