I've been using a Dell 2405 for over a year now and have only good things to say about that. Games that have native widescreen support (like LFS) looks great. Games that don't can often be hacked to look good aswell. If not it also supports 1:1, giving you black bars around.
My previous setup with a 3500+, 1gb and x800xl ran LFS at 1920x1200, 4xAA, and everything maxed out, steady at 60fps all the time. Using a lower res, like 1680x1050 also works, and ingame you don't notice any difference.
The 2405 is now replaced with the 2407, but the biggest difference is probably the design. When its on sale, its not expensive either, considering what you get. Great image quality, nice design, lots of adjustments (do NOT buy a monitor without height adjustment!) and lots of connections. Atm, I got two computers and one xbox 360 connected to it.
After some time with a widescreen you start to wonder how on earth you could use a 4:3 (or even worse 5:4 19" lcd) before..
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