last question....you using cable,direct tv/dish or antenna?....
getting an hdmi cable could be crucial to the kind of picture you get...you can get one at walmart/target/best buy/radio shack....pretty much any place(and the prices are all over the place,don`t break the bank for a cable)....i`m sure you have more than one hdmi jack on a 50" tv,so if you`re using a dvd player/blu ray or home theater with it,you`ll want one for each...
if you sprung for a 50" tv,you have to get the hdmi cables(particularly with a cable or satellite/dish hook-up....makes all the difference)...