Even Corsair 450W is enough.
Try getting a decent antec, or Corsair PSU or a seasonic or a gigabyte PSU.
I notice that you live in India. Maybe you should try www.techenclave.com and www.erodov.com
Just register and go to forums>Dealers section. You should see some sellers selling the aforementioned PSUs. Buy one. 450 to 550W PSU should be enough from the aforementioned brands.