LED and LCD are very similar designs regarding the panel. The type of lighting used on the panel is the big difference. After that you need to know if it is edge lit vs. full back lighting. Another key difference is the ability to turn off the lighting to produce better black levels.
I have four Samsungs and after tuning them properly, which can take some time and money if you are unfamiliar with the process, I can honestly say I love all of them.
Again the Samsung 60" at Costco is a great deal right now.
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