After weeks of research and toiling, I've finally made up mind to go with a 50" Panasonic plasma for my HT. Unfortunately, now I'm torn between two sets. The Viera TH-50PZ85U and the Viera TH-50PZ800U. Both have received very high marks as being the only plasmas that come close to the picture quality of the Pioneer KURO sets – at a fraction of the cost. But here's my dilemma. A few folks I've spoken with at the big box stores have insisted that calibration is an absolute must for any plasma TV. However, they also claim that the 800U model is already pre-calibrated thanks in part to it's THX certification. The 85U costs about $300 less than the 800U, but from what I've been told, that's about how much it would cost to have the 85U calibrated. Is this a six of one, half dozen of another situation, or is their an obvious winner here? I want to believe the 800U is a no-brainer, but can I trust that the "pre-calibrated" talk is valid? I don't want to invest the money, only to find out that it still needs professional attention when I take it out of the box. Any guidance would be deeply appreciated.