Is the quality of LED worth the $200 price difference?
In my opinon, the quality of Samsung alone is worth the price difference.
I'm sort of a samsung junkie so my opinion is pretty biased, but thier SmartHub is far superior to other manufacturers (again, in my opinion).
Its almost like comparing thier top end app availability to that of iOS when comparing that to what you can get on the Window's Phone. There's just more "stuff" on the Samsung smarthub.
If "stuff" isn't your thing, buy for price. LG has some solid LEDs for a decent price.
And if you're a sports fanatic, Samsungs ClearMotion technology delivers the same sports experience as a 600 plasma. Samsung LEDs without ClearMotion technology, however, has a lot of ghosting on sports and 60fps gaming. But ClearMotion LEDs, you can almost not tell the difference in the clarity between that and plasma.