You can pick up the Dell 2005FPW for under $400 if you shop around. It's a 20" widescreen unit. They do a 24" version that's a fair bit more expensive.
I use mine for video editing. The contrast, brightness and clarity are superb. It's also a pleasantly crisp display that doesn't crush some blacks the way a few cheaper units tend to do. (The Viewsonic also scores well here)
That said, it's not great for watching DVDs, as I sometimes do. The backlight is so bright, the corners/edges of the display are lit through enough to appear gray if watched in an unlit room.
At the end of the day, it's the same panel as the 20" cinema display; the case isn't intrusive to the eye, it can handle multiple inputs (great for reviewing video before importing it) and you can find it under $400 because it's being replaced by the functionally identical 2007FPW.