Pantone huey Monitor Color Correction-Calibrator
 

We all perceive color differently. When you go over to the next cubical or office, you might notice the color display of your peers look different than yours. Which one of the monitors produces the more accurate colors? Maybe Pantone huey can help.
http://www.madshrimps.be/gotoartik.php?articID=640

Good comparison with the pictures, it pretty much explains why 70$ isn't much more to pay when you buy a 600$ or more Display.

It is even a better investment if you have more than one display at your household.