gddr3 you could get a gt 710.
If you want a gddr5 gpu, that would require at least a gt 730 or R7 240.
In order to use a gddr5 gt 730 or R7 240, you would need to buy a new psu. A Corsair VS450 is a cheap, low quality psu. It is the cheapest and lowest quality psu I would recommend.
The total cost of psu + gpu (gddr5) is around Rs 7600.