What TV's are on your shortlist after visiting a few shops and talking with the sales person?
Most of the TV's you'll find with such a size of screen will be 'Smart TV' or '3D'. So those are more expensive, although, of course, you're not required to use those features.
I want to purchase a tv solely to watch cable tv. I could care less about interner, addons, 3D, etc. Looking for something in the 50-55" screen size that will give me good service and picture. I am too old to want anything but a tv.