The highest contrast ratio of the Terra 2445W is 20000000:1. That's over four times the contrast ratio of a 5000000:1 LCD screen, which is the most common contrast ratio. Across all medium screen size PC screens that are a similar age to the Terra 2445W the best contrast ratio is 100000000:1 and the worst is Mega Contrast.
Other LCD screens that have a 20000000:1 dynamic contrast ratio currently available that you might want to consider include the Viewsonic VG2433 (£140.92), or the Philips 231C5 which has a better Rating.
PC monitors with a higher contrast ratio that might be worth considering include the i2367 (£134.23) (50000000:1), or the E2461FW (£122.19) (50000000:1) both from AOC which also has a higher rating.