The Asus VG23AH has a maximum contrast ratio of 80000000:1. That's over four times the contrast ratio of a 20000000:1 PC display, 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.
We compared this PC screen to all the other LCD screens that have an 80000000:1 dynamic contrast ratio and we think because of it's better review score, the Q2770 (£320.11), and the G2770 (£219.99) both from AOC is also worth considering.
If you would prefer a PC display with a higher contrast ratio then you might want to consider the PB287 (£259.99) (100000000:1), the VN279 (£119.99) (100000000:1), or the PA279 (£622.51) (100000000:1) all from Asus.