Go look if you can. Ratings can be deceiving. 300 candlepower is great on a 21" monitor. It sucks on a 60 incher.

Another thing with LCDs is some fuzz out or fade if you get a few degrees off center. Figure out  where yours will sit on your desk and try to look at the store display from the same angle. Is there a big sweet spot or will you have to shift your head a few inches every time you look up? Minor annoyances can build and drive you crazy over months. If it bothers you just a bit in the store don't take it home.