Other than all the gyaan available on Internet, it's the fact that all that cost in LED, LCD or Plasma is the panel.
And panel can go faulty at any pint of time. It may be at fault within weeks of purchase and if it's made with best caring, it might go perfect till 5-6 years.
So, forget about who is supplying what and who has bigger brand name. . Almost all are same.
Only thing matter is which company is providing maximum warranty and whose officials are reachable in real life.
So, after lot of googling and reading testimonials, I found that Samsung and LG are best reachable with best extended warranty offers where as Sony is the least cooperative . If anyone have any idea about other companies, pls share.