Panasonic 58" 800 or 850 ?

[DezNutz]

Alright I am looking at the Panasonic plasma models in the 58" range and want to compare these two models.

I can get the 58" 800 for 2,900 shipped and the 58" 850 for 3,129 shipped. My question to the board is what do I get for the extra 229?

From all I can tell I get some more calibration options, and lose the THX certification, is this worth it? If price was equal which model would you get?

I see the price of the 65" 850 is 2,000 more, and I cannot justify 2,000 for 7 more inches and the same specification.. I also am not sure the Pioneer Kuro's are even in the same ballpark price-wise..