Another consideration is getting the same brand TV as your DVD player. I have Samsung TVs and DVD players, which means the remotes are compatible and in your case, everything can be done with the DVD remote, since you don't use it for cable or on-air. If your DVD player is ancient, consider getting a Bluray DVD player. They're pretty cheap now and will give you a much better picture.
Avoid all the gimmicks like built-in wifi or wifi ready, since you don't seem to use such features. One thing getting really cheap is 3D plasma TVs, which might be of interest to you since movies are coming out in 3D.
I’ve seen a few 3-D movies, but I haven’t personally seen any movies where seeing it in 3-D made the difference for me.