Ask yourself if you really need wide screen. I thought about one myself, as they come much cheaper than the standard screens, but I realized that it would be practically useless since what I use mainly involves A4 documents or web pages, and since most designers these days get over-excited by background images and using non-scalable units, its not as if most web pages would adapt to such a wide screen anyway. The only time I think they're useful is when they have a swivel screen, allowing you to see more of the document.
This is of course unless you do more gaming, or watch movies, neither of which I really do. Ask yourself if you really need one.