I have to say, if you've got a computer that can render your games at 100+fps... go for a true-120fps monitor(something Nvidia 3d-vision compatible). It's actually pretty darn nice, even without 3D. Basically, it reduces the need for motion-blur, and makes fast screen changes look way nicer.
I spent $500 on mine about a year ago, and while it *is* a TN display(which only displays 6-bit color, dithering the other two), it's actually *very* nice. I haven't yet regretted my purchase even once, which is saying something.
I'd ignore all contrast numbers; it just doesn't really matter at all. Brightness is also only an issue if you're in a very bright room, otherwise you'll be turning it way down to prevent eyestrain.