The best is in the eye of the beholder. Some people pay $5,000 for "the best" and others have a more limited budget for their "best." And, by the way, LED is also LCD. LED refers to how the LCD screen is lit. LCDs are either lit by LEDs or CCFLs.
Do you want 2D or 3D? There are multiple threads on the first few pages of this forum regarding 55" & larger CCFL LCDs & LED LCDs. My advice is look through the forum, go to some stores to see what you may be interested in, educate yourself a bit, and then come back with some specific questions.
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