You're going to get a myriad of opinions on here, but I suppose that's exactly what you're looking for. I firmly believe plasma TV's are hands down the best way to go in virtually ever performance category. Contrast ratios, black levels, color reproduction, refresh rate, off angle viewing, the list goes on and on. IMO the only edge LCD's of any variety have the upper edge is sheer light output, however again IMO PDP'S get plenty bright. Your viewing environment is going to be a pretty big deciding factor for which display tech will work best but like I mentioned earlier, I'd suggest PDP'S, unless you're living in a warehouse. And as far as TV's go, I feel like the pretty overwhelming response you'll get is going to be the Panasonic VT50 which comes in both 55" and 65". If you're considering LED/LCD then look at some of the backlit (preferably local dimming models) not the edge lit types as from my experience most of the edge lits suffer from uniformity, of course some are better then others depending on model. And if you're going toward LED/LCD then the Sharp Elite would be the number one response you'll receive as well the problem their is that it's a big chunk of change for either size. They come in the 60" & 70" models. However if you can afford it IMO it's hands down the best performing LCD.
Other LED/LCD's to consider- LG LM7600 (though it is an edge lit I feel as though it performs very well and has local dimming which IMO is better than none, much better),
Sony XBR HX950 which is a full array local dimming, the best kind of LCD by far.
Sony HX850 (another edge lit but still a good performer and a local dimmer),
Samsung ES8000 (edge lit local dimming, I feel like this particular model is over priced though)
Other PDP'S to consider- Panasonic GT50, the step right below the flagship VT50, there is debate out there about much better this model is than the ST50, I'm on the fence about it. Regardless still a fantastic FP.
Panasonic ST50 I argue this is the best value/performer in its category this year and maybe ever for what you get as far as dollars per inch goes.
Panasonic UT50 (another great value for the dollar, performs incredibly well. The only thing it misses that the ST50 has is the Infinite Black Panel, which I think is a big helper in performance, and the UT50 doesn't handle ambient light very well so it'll have to be a darker environment.
Samsung E6500, has the Real Black Pro Panel which is Sammy's version of Infinite Black Panel which again I think helps in performance.
Samsung E8000, Sammy's tippy top PDP which is another great performer but at that price I might be swayed toward Panasonic because again IMO they're the best PDP manufacturer.
Sorry to overwhelm you with model numbers and etc but those are some of the best running TV's IMO. (Side note, the Sharp 640U is also a great TV for the $ but IMO but options out there)
In the end I think the best TV's available are being churned out by Panasonic and I'd recommend either the ST50, GT50, or VT50 because they have the best performance on the market and they're all versatile in the sense that they can perform exceptionally well in all viewing environments
Good luck with your decision! Keep us all updated