It may just be me, but becareful with those 22" or cheap 24" lcds they use a different and cheaper panel technology called TN (i think)
I order one of the cheaper 24" TN panel lcd, but just couldnt stand the screen, it flicks and brightness is not even, gives me a headache looking at those numbers after half hr. Returned it and paid $200 more for a 24" dell ultrasharp and all the problem (and headache) went away.
As far as i know all dell ultrasharp uses the non-TN better panels. I think it's worth the investment to pay a little extra since you will be staring at those screens all day long.