Aliens Called "LCDs"

[Husar]

Is largely irrelevant if you have only 1 monitor, though. With 2 you'll probably want 2 identical monitors anyway because no 2 monitors display identical input the same.

Eh, no, a lot of people say you can feel it for example in shooters because everytime you make a mouse movement, it takes a while until you see it on the monitor, not even a second but in multiplayer this can be important for example. Must say I haven't tested it myself but I can see how it could potentially be annoying.

Simple question:

Is looking for a 2ms unnecessary ? Would spending the same money on a bigger LCD with 4ms response time be more reasonable ?

I'd say yes, don't know what mine has but usually anything below 8ms is fine, you cannot trust the numbers anyway as there are different methods of measurement and measuring grey-to-grey gives lower numbers than black to white or something like that, but if it's a TN panel there shouldn't be any tearing nowadays and all other panels seem to be above your budget anyway.