Quick, I have the Sammy PN50A550 loves it. It's the same TV than the PN50A650 except for the antiglare coating for brighter rooms since mine is in my basement, i didn't have to worry about that. The Pannys are great too, but IMO after a side by side comparaison, the Sammy pic is out of this world. But beauty is in the eye of the beholder so go with wichever you prefer, you can't go wrong with either. BTW check the AVS forum, they have threads dedicated to both TVs with tons of information.

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X5 4.4
E46 M3 Vert