this is best at your budget
As you are already getting a new graphic card, i would suggest i3 3220 (7k) adn Gigabyte b75m dh3 (4k).
AnandTech - Bench - CPU
i3-3220 is dual core with hyper threading and thus it is very good for gaming at your budget
it can beat core2quads in majority of case
also you will need atleast a gtx650ti (~Rs9000) graphics card to play good games