I'm guessing that is a pre-built system, since you have an iBall PSU. Considering that, the maximum I would go is a GTX 1050, maybe a GTX 1050 Ti, nothing more. A GTX 1050 is my recommended card, should you have the budget for it. Your power supply and CPU both are quite limiting - the PSU is some no name unit with probably no efficiency rating at all, so putting any good GPU with high power consumption would be a risk. An i3 is also a bottleneck for anything over the GTX 1050, especially at lower resolutions like 720p.
If possible, change that PSU, please. It is a fire hazard, nothing more and nothing less. Get a good PSU, and only then think about upgrading the GPU.