I just bought a Samsung 23" model "2333 sw" and just connected it this afternoon. Bought it for $250 at Best Buy and it completely exceeds my expectations.
If you're interested in using it as a TV as well, I just got a Samsung T260HD, and I love it. They make the same model in 22-inch and 24-inch as well, I believe. It's pricey if you only want a monitor, but I like having the TV tuner built in.