Question

What about contrast ratio?

Contrast ratio is a misleading term...
It is the difference between extra bright sections and dark or black sections of the picture...

What manufacturers use is usually a dynamic number which means nothing really, just that they use a 100% white screen for white, and a completely black screen for black...

You need to see the video pictures in the store with a video signal that you know...

One that contains lost of black, lots of whites, and very good range of grays...

Try a movie which you know has this, like Dark Knight, or Batman Begins, T2 is also good...