Generally speaking, monitors with IPS panels like the Dell U214H will have better color accuracy (when calibrated) vs. other types of LCD panel technologies, but they tend to have slower response times (6ms - 8ms). They also tend to be a little to a lot more expensive than other types of LCD panel technologies.
The two monitors suggested by i7Baby have TN panels which offer faster response times compared to IPS panels (1ms - 5ms), less color accuracy (though not really important for games), but also narrower viewing angles which means as you move your head you may notice some color shifts.
You basically need to decide which is more important to you; faster response times (TN panel) or better image (IPS panel) quality. Personally, I prefer better image quality.