Well I would buy the best ofc, a GTX 980. but thats way far from my budget. My cousin will give me his video card, he has a GTX 640, quite good actually.
Right now I have a Gt 430.

Nvidia 4 the win /o/

lets make it more interesting, lets all say what hardware and software we have;
I have:
Windos 10 pro 32-bit, ADM Phenom 9650 Quad-core Processor, 3 gygas of RAM and the video car (NVIDA GeForce Gt 430)