I posted this a week or so ago. The only thing I would add would be to make sure that if you're going to have it shipped - insure it. I've been told shipping monitors is one of the biggest reasons why new ones go hay-wire. I hope it helps:
For starters, the screen is perfectly flat: horizontally and vertically. Actually, it took a little getting used to cause I'm so used to a horizontal curve...
The picture is very crisp - watching a DVD with this monitor reminds me of HDTV. As for gaming, which I do a fair amount of, when I look at other people's monitors, I'm reminded about how nice my is.
I have 3 Sony monitors, two 21's and a 19 and each one has been a rock solid joy. My only gripe on the new 21' is the display control - I believe they changed this in later models. It used a little rocker that controlled everything - to select something, you push up. I really prefer multiple buttons.
My first 21" I bought 5 years ago and paid 1.4k for it. It's not as nice as the newer one (only because it still has slight horizontal bend) but the picture quality is still outstanding (that's pretty good since I've moved 6 times since I bought it...)
Once thing I use to determine what separates one monitor from another is how sharp images are in the corners. The corners are furthest away from the electron gun and thus are more likely to a little blurry in lower quality monitors. A good way to test this is to bring up a text doc full misc. text and look for distortions. My monitor at work is pretty bad and this little "feature" drives me nuts.
I bought the new 21" cause of the price - you can't beat 700 delivered for this good of a monitor. I've never had any issues with any of 'em and recommend them at a drop of a dime.
If you're really going for the gusto, I would look around and see if you can find a demo of Sony's 24". It sells for about 1.7k
Your monitor is the one thing you're never gonna upgrade. It's the eyes to your computer. The better monitor you have, the more enjoyable your computing will be.