After paying ₹2000 on custom of all parts, it is not gonna fit in budget.Corsair Builder series uses a cheap capacitors and sleeve bearing fans. Seasonic S12II would be better
Here are some links you can check out -The new CX*50M units are actually okay. Still not Seasonic quality but better than CX500 for sure.
It's hard to suggest anything not knowing what's available and at what prices.
Appreciate that.Go with the CX650M, there's no better for under 6k. It'll work fine, and it's backed by 5 year warranty which is a welcome change from previous CX units' 3 year warranty.