whatever size you buy, buy a Samsung.
don't know if you remember, our 2 1/2 year old Samsung TV died and they replaced it with a new one (worth over twice the price of old one)
Basically, if it wont last for 5 years they will give you another one free of charge (Australian consumer law on big brand stuff)
My TV repair man put me on to it.
he said that Samsung were the best out of the big brands to give you a new TV.
He said I now get another 5 years on this TV, if it dies they will give me another new one.
I perceive that I will never need to buy a TV again, LOL