You are assuming the 2-4K is in US Dollars. Is it, or is it INR? Afterall, the question was about his PSU budget, not the budget for an entirely new build.
You don't want to get a cheap PSU. If none of the ones on Proximon's list are available to you, my quick and dirty rules are: Full range active PFC (no little voltage switch) and some level of 80+ certification. 80Plus tests at an unrealistically low temperature, but they do run them up to full labeled power for over half an hour, and a cheap PSU will blow chunks if you do that to it.