The highest contrast ratio of the Samsung NS240 is 1000:1. That's 100% less contrast ratio than a 20000000:1 flatpanel monitor, which is the most common contrast ratio. The best contrast ratio of all flatpanel monitors of this age and spec is 100000000:1 and the worst is Mega Contrast.
Other PC screens that have a 1000:1 dynamic contrast ratio currently available which you might want to consider include cheaper PC displays such as the Asus VS228D.
If you are looking for a flatpanel monitor with a higher contrast ratio then you might also want to consider the ET220a (10000:1 and cheaper), or the ES240d Slim (10000:1 and cheaper) both from Edge10 or the HP ZR22w (3000:1 and higher rated).