Cnet: 37? 42? 50? 65? 90? There's an HDTV size for every room and every budget.
But if you're not limited by a cabinet or entertainment center, how big of a TV can or should you get?
The short answer: as big as you can afford. The longer answer depends on your room, your seating distance, your eyes, and the acceptance of any cohabitating co-deciders.