Good enough card to support any monitor you could possibly want. Sky's the limit.
You really need to narrow down your size though. I'm biased, I'm gonna suggest a 30". You should get out some cardboard, cut out a board to simulate the different sizes, and see which one is comfortable. The resolution will make a difference of course, but standard fair right now is 1920x1200 or 1680x1050. Unless you go large screen.
Check out a local computer store so you can decide best on a size if you don't want to make mockups. Find a size and specify a budget, we can steer you to the best monitor for your bucks.