The highest contrast ratio of the ColorEdge CS230 is 1000:1. That's 100% less contrast ratio than the most frequently found dynamic contrast ratio of 20000000:1. Across all LCD screens that came out around the same time as the ColorEdge CS230 the best contrast ratio is 100000000:1 and the worst is Mega Contrast.
Other PC monitors that have a 1000:1 dynamic contrast ratio currently available that you might also want to consider include the Benq BL2710 ($1,705.18), or the Samsung S27A850 which is cheaper.
LCD screens with a higher contrast ratio that might also be worth looking at include the NEC MultiSync EA244WMI ($249.99) (25000:1 and cheaper), or the DELL U2713H ($689.99) (2000000:1 and cheaper).