You guys...
Plasma is awesome, and so is LED - you won't be disappointment with any of them.
LED is brighter during the day and doesn't reflect as much, Plasma is supreme with blacks and color if you have some curtains, and has wider viewing angles (the colors don't turn to sh*t at a 45 degree viewing angle for example)
Plasma uses a little more power, but has better motion handling and a lot better SD Quality. LED is better for Static Image viewing.
Choose what you need and don't trash the other tech whether it be LED/LCD or Plasma.
We don't need a flame war, it's just a TV!
Plasma, LED...bleh, who cares - you will be happy with both.
Even all the specs you guys bring up.. 0.051 cd/m2 or 0.039 cd/m2 who gives a shlt?
I'm thinking you will be a lot more chuffed with a 60 inch beast over a 50" in the end though, even without the "Micro-Motion-Crystal-LED-flux-capacitor-proton-quality-performance-boost-chip" the Sony might claim to have... but that's just me.
Size matters and don't let anyone tell you it doesn't.