The highest contrast ratio of the Asus VK207 is 80000000:1. That's over four times the contrast ratio of the most frequently found dynamic contrast ratio of 20000000:1. The worst contrast ratio of all PC monitors of a similar age and type to the VK207 is Mega Contrast and the best is 100000000:1.
Other LCD screens that have an 80000000:1 dynamic contrast ratio currently available that you might also want to consider include the Asus VS207 (£79.32) which has a better Rating; or the Hannspree HP205DJB (£77.95), or the Hanns.G HX194 (£92.96) which is cheaper.
LCD screens with a higher contrast ratio that might be worth looking at include the 176L (£89.65) (100000000:1 and higher rated), or the 196L (£97.62) (100000000:1 and higher rated) both from Acer; or the Packard Bell Viseo 193DX (100000000:1 and cheaper).