The GTX 750 is often recommended and will be about 10,000.00 ₹ depending on where you get it in India.
The GTX 760 reportedly works well, with FPS stable at 30 with high settings and moderately large scenes, which will run you around 17,000.00 ₹.
I use the r9 280x, getting very good frame rates on Epic quality (though I almost always run on High), and that will cost somewhere around 25,000.00 ₹.
Your budget is largely unspecified, but those are three widely used cards in different price ranges that work well.
Your processor and memory are very good.
You may want to get a faster hard drive or a small SSD (120GB will be fine) for faster loading and development.