Little help with PC hardware

[SERIOUSLY THOUGH]

Well, as with everything techie, there's gonna be some who say "ATI iz de best 4eva" and some who say "NVIDIA is da bawm" and then both subsequently throw verbal excrements at each other.

My laptop runs a 256MB NVIDIA and I've been able to play all the modern games that say "minimum 512MB" on decent settings - So thumbs up NVIDIA.
In any case, a 2GB graphics card will be kick-ass for pretty much all games regardless of the brand (though stick with the known brands, like the one you listed).