And apparently as long as the contrast is above 1000:1 you won't even be able to notice the difference with the naked eye between like 20 000:1 and 200 000: 1
Ignore the super-high Dynamic Contrast Ratio, it's almost marketing hype. Look for static contrast figures instead.
Static contrast is the actual ratio between the lightest and the darkest colours which a screen can display on a single image. Dynamic contrast refers to the ratio between the lightest and darkest colours over various images, which is more applicable to video, than to the effect on a static image.
See http://en.wikipedia.org/wiki/Contrast_ratio and http://blogs.zdnet.com/Ou/?p=935