Don t buy a set that is too large. Try and leave at least inch of space for ventilation. Also measure the viewing distance. For the best viewing, a 27 inch TV should be at least 8 feet away, a 32 inch set should be at least 10 feet away, and a 36 inch set should be at least 11 feet from the viewer. For more accurate images try a flat TV screen.
Curved screens have the tendency to distort images.
Well try watching it in black and white. This will help you focus on the clarity of the picture. After you have watched it in black and white, gradually return the color and watch out for details like fine facial features and shadows. The more detailed the better. Before leaving the store be sure to check out the remote and make sure it works properly.