Just something to keep in mind......The TV you buy now is just a 3-4 year stop gap until OLEDs become cheaper. OLEDs are going to be CHEAP as compared to the LEDs we have now, and pic quality will blow anything on the shelves now out of the water. I got my 60" last November and I am good to go until the next round hits.
Nothing wrong with getting a plasma before they are gone. Great for dim rooms, wonderful black levels, but the latest backlit local dimming LEDs can match the black levels. Never thought I wanted a "Smart" TV until I got one.
Buy what looks good, but don't throw a bucket of cash at something you might not use as your main TV for as long as you think you would.
And yes, the Samsung 8500 series plasmas are the holy grail now, but every seller knows it and charges accordingly.