Room size and budget typically are the primary factors when deciding what size television to purchase. There are many competitive brands, but your personal restrictions are what ultimately make the decision. Newer technologies such as LED screens are usually more expensive than TVs using plasma or LCD.
Consumer Reports offers a very basic set of rules to go by; for example, if you sit at least 5 or 6 feet from the TV, choose one that ranges in size from 40 inches to 47 inches with standard high definition. Allow at least 6 to 8 feet of space between the viewing area and a television larger than 50 inches.