So you want a 4:3 ratio monitor?
Are you sure you don't want widescreen? While support does tend to take awhile for games, for the most part it's supported.
I just got a new one not too long ago, it was pretty cheap, about $156 USD. It was on sale, normally $200 USD or so. It's a decent monitor, especially for the price. There's one stuck pixel, and that may or may not solve it self over time (I know it's stuck because it's light blue) It's getting harder to see actually.
Anyway, it's a Sceptre X20WG Nagga, what this tells you is that it's 20". Some things I don't like about it, which is a trait of most Widescreen monitors, is that it's 16:10 ratio (the box said 16:9!) and it's native (and only) resolution is 1680x1050.
It claimed to be 1080i compliant, but that's just bulls**t, because the maximum resolution is 1680x1050 (1080 is 1920 x 1080, which isn't even the same ratio!)
Anyway, after I stopped being annoyed, I thought the monitor was pretty decent. It has built in speakers, which reproduce sound as well as any stereo desktop speakers I've heard. It's nice to hear some audio without turning on my receiver.
I bought it from Costo. You can try looking at their site for deals in your area (if you even have them). Other than that, you know, it's really up to you to find a monitor. Unlike other computer parts, monitors are really a per-user per-basis thing.
Search for one that reproduces what you want and has a size you like at the price you want.
Edit
Two of the things that are nice about it are the contrast and response time (1000:1 and 5 ms, respectively)
Blame it on Microsoft, God does.