Panasonic 50 gt50
panasonic 55 st50
I would go for the Paasonic 55ST50 based on its stellar and premium performance. And it has the best black levels.
Home cinema system: LG 55EA980W OLED TV, Pioneer Bdp-lx71, Pioneer Vsx-lx70, B&W FPM Series, B&W PV1.
Gadgets: iPad 2 and iPhone 4s. Dab radio: Roberts Dreamtime.
Just bought 55HX853, VERY happy