I have a Samsung 900NF and love it. Right now you can find them for about $390 shipped (see
Pricewatch). High refresh rate, 19", good resolution, very sharp. It's an aperture grill (Trinitron-type) monitor, which I vastly prefer over the shadow mask monitors. When I bought it, I dug around for reviews and this one had some of the best reviews and specs I found.
My friend has been using my computer for a week while we're waiting for parts for his. It only took a couple of days before he starting thinking out loud about ordering a 900NF for himself...
Edit: Oh yeah... it's a flat-faced CRT, too. Makes my old monitor look like a fishbowl in comparison.