Price depends a lot on size too. I agree with irishrose to stick with Samsung, LG or Sony. We ended up with the Sony because the picture seemed so much better. (With our aging eyes, I try to get things that are super easy to look at.) It was pricey, though. We probably wouldn't have chosen that one had it not been on sale at end-of-season for quite a bit off. It was about 50% more than what we thought we would be paying, and that was on sale. One of the younger, just-married salesman in the laptop area said he ended up buying a Vizio (much less $$$) and that he and his wife are very happy with it. A lot depends on what you are looking for in terms of size and picture quality.
I asked about sound, as our ears are going the way of our eyes. Was told none of the tv's have great sound on their own because of the small speakers located in the back of the tv. However, what we plan to do is buy a "sound bar", which is a long narrow speaker that you can place at the base of the tv (our tv will stand on its legs rather than be mounted legless on the wall) and hook into the tv so you get better sound facing you.