I dont know if its too old thread but yet i am giving my input.
Samsung and LG LED tvs are hands down great, you can buy any one and you wont be disappointed but these TVs are too much costly, ig cost is no issue then look no further and buy Samsung or LG.
But if cost is your issue then i would suggest you NOBEL other then all chinese brands like ecostar,heir etc etc. NOBEL is also chinese brand but its of superior quality, i purchased D3000 49' LED tv for Rs. 51000 last week and i am satisfied so far.
They also have Smart/Android TVs and Curved TVs. If you have budget then go for the one which has Harman Kardon Speakerbar builtin (There is one special model in UHD tv section perhapes) and it will cost around 1 lac for 49' ( iam not sure if its 55'), check their website.