LCD

[McNeo]

All of them have D-sub inputs which provide inferior image quality (in general) than those displays with DVI inputs.

D-sub is older analogue technology which can hold less data per second than DVI, which is digital, so DVI can provide a clearer display, in general.

Two of those screens I see have a 1680x1050, which is a good high resolution. I would recommend either of the ones that do have this resolution, as it is superior to the 1440x900 resolution supported by the 19" panels.

However, there is a problem. Your graphics card is the lowest tier in the 7-series range, and is not meant for gaming at all, only media work and rendering on a tight budget. With 1680x1050 resolutions, you wont be able to play newer games properly.

But, I would probably get the Asustek screen if I chose between that and the BenQ. Reason is because the Asus screen has a higher contrast ratio and it also has better viewing angles than the BenQ.

If I was buying out of those 4 you listed, I would get the Asus one.

Hope this helps!