47" or 55" TV for 8 feet max distance ?

[Kannan]

I am planning to get Full HD TV. My max viewing distance would be 8 to 9 feet.
Most of the contents would be SD and some in HD.

I am confused which one to choose between, a 47" TV or 55" TV.

What do you guys think ?

TIA

 

[Minion]

First mention your budget?which models are in your mind?

 

[Kannan]

Don't mind. I ordered the Sony 47W580A.

Initially thought 55" should be good. But even Full HD looks pixelated at 8 feet. So decided to go for 47".