The highest contrast ratio of the Asus VH228 is 50000000:1. That's over two times the contrast ratio of the most frequently found dynamic contrast ratio of 20000000:1. The best contrast ratio of all medium monitors that came out around the same time as the VH228 is 100000000:1 and the worst is Mega Contrast.
We think you might also be interested in some of the alternative PC screens that have a 50000000:1 dynamic contrast ratio currently available including the AOC E2260 (£77.11) which is cheaper; or the AOC i2476 (£104.99) which has a better Rating.
If you would prefer an LCD screen with a higher contrast ratio then you might want to look at the Asus VE228 (£79.98) (80000000:1), or the AOC G2460 (£175.91) (80000000:1) which is also higher rated.