Lots to consider.
Would a wall mount be a better option?? I know they said the cabinet wouldn't hold over a 27 inch, but that was the older CRT technology, MUCH heavier. What does the old 27 inch CRT weigh?? Close to 55 pounds, maybe. That's what a 50 inch HDTV would weigh. Weight's not the problem. A tape measure in the store will give you a good idea of what will fit. 120 cycle sets show twice as many pictures per second and the process makes images made up of the previous frame and the next frame to fill the spaces inbetween, giving fast action events smoother action to the eye.