Mark are you looking at the SXGA or the UXGA screen?
I have the SXGA and there is no comparison to the Dell. The SXGA simply blows the Dell ultra sharps out of the water. The closest screen to the SXGA in terms of sharpness, viewing angle etc etc is the Samsung 191T LCD monitor. If you can get to see one of those it will give you an excellent idea of the quality in the 8890 as they are very similar (even to viewing area).
As I don't have the UXGA I have no direct comparison although I believe the Toshiba CASV UXGA screen on their latest Satellite Pro series is close to the Sager's UXGA.
Personally I would go the SXGA, I program and for a balance of screen area to readability the SXGA is ideal. UXGA will give you more screen area but you may find reading it a bit hard. Depends on your eyesight. Also if you are like me, I tend to sit back and contemplate my code as I write it, so the SXGA is still readable down to the nuances of a ; vs : and 1 vs l and O vs 0. If you are a programmer you will know what I mean (those pesky little typos

).
Either way you will appreciate the speed of the Sager when compiling (get a RAID 0 setup

).