Well, you got to do some research to see what will best fit your requirement.

To summarize,

If you check Samsung, they go by number series, the higher the series more advance it get, similarly Sony is classified by Alphabet and i am yet to see the highest Quality Sony in Doha.

I suggest that you go for the next generation tv which is the LED. So drop in at Samsung showroom to pick ur piece!
I bet the LED has the best features so far!