I'd go for Pana as Sony has a history of trying to steal from their customers by overpricing products that are far below the average, without clearly stating it of course.
They have and have had good products, but the risk is too high with them.

Same goes for samsung, having calibrated and specific screens for reviews, and then swapping panels as they wish with the exact same product code... of course, the swap is never for better quality, strange isn't it?
RMAs tend to be slow and painful process too...

Why do sellers advise for LCD's for gaming?
Well, plasmas burn-in still have problems with still images, although lighter... but I guess gaming could be very intensive.

As always in that dumb tech world, you have to make a compromise...