Nope, should support anything (especially an LCD) can throw at it. You may want to poll some people running 20'' Dell LCDs to make sure the GF4's look ok at that high a resolution. DVI will certainly help, but I think some people with CRTs were complaining about blurring at really high resolutions. I was hoping the 9700AIW might have dual-DVI..but it didn't happen

For the single workstation, yah any card with DVI will be fine. Not sure what type of work you will be doing or if you are also gonna be gaming, but for straight 2D, you may consider a cheaper Radeon as their 2D is still slightly better than nVidia's (especially at higher resolutions).
Before smacking down that kinda cash, run a search in hot deals, video, and gen. hardware and type in Dell. Then PM the folks with the 20'' or larger LCDs, there are quite a few of them around. My 1900FP only does 1280x1024x32 @ 60hz, so I can't help you there.
Chiz