For me 3D is a waste of time, but I won't go down that particular rant now.
I bought my Sammy 55" 6-series LED telly two years ago when they first came out, and it was an amazing picture then and it's still amazing now. Obviously it's been superceded by the 200hz models (mine's only 100hz) so they look even better now, but I'd happily buy another tomorrow without question. The only downside is the remote, which for a £2500 TV is an utter disgrace but then Samsung use the same remotes give or take across many models to save costs so I can understand that.
All that said, DO NOT BUY THAT TELLY WITHOUT VIEWING IT. Go down to your local Currys/Comet for 9am on a Saturday morning, or during the week is even better, and take a particularly impressive BD with you (I used Independence Day as it has lots of fast moving images and plenty of blacks) and try it on a range of TVs. What works for some people make look gash to you, so don't buy without trying it first. I took my Xbox an a copy of Forza 2 with me when I bought my TV and made them set that up for me as well, as before I drop a load of cash you can bet your ass I've going to test it first.