Alright, then I would suggest you stick with either XFX, Seasonic, EVGA, Corsair, or Antec companies. They all make pretty good units. I have helped people before who are located in India, and it seems rather difficult to get good parts for a decent price there. But if you stick with the companies I listed, I would say you will be in good shape.
And Dubbleclick makes the Corsair vs series sound like they are crap, and that is just not true. They are actually fairly decent. I would trust one in my system.
I would however try to get at least 600 watts. So if you can find a 600 watt from one of those 5 companies I listed, I would get it.