Good 600W between various models of Corsair, Cooler Master and Antec. Budget is very low.

Actually the only unit you want to avoid in the Corsair lineup its their old CX series, their new CXM however has fixed several issues regarding durability so those are a good choice (though at that price range there are better offers from other companies).

Given you're from India it would be good if you post a link for a website from which you're going to buy, this way we can see which available model is best for your budget.
 


All PC components are $20 more expensive in India. So CX600 is crossing my budget.
 


www.mdcomputers.in
www.vedantcomputers.com
www.amazon.in
 


There are no good PSUs at 600w within your price range in those websites, the "best" you can get within your budget would be the Antec VP550w:

http://www.amazon.in/Antec-VP550P-550-Watts-PSU/dp/B00565RGQA/ref=sr_1_1?s=computers&ie=UTF8&qid=1501003027&sr=1-1

There's a cheaper one on mdcomputers.in but it shows all the psus they have as "out of stock" so dunno if that's accurate.

Post your full PC specs to see if this unit will be enough, I'd definitely advise you to save more money and get instead a Seasonic M12-II Evo 520w Bronze:

https://www.mdcomputers.in/smps/seasonic-520-watt-80-plus-bronze-fully-modular-m12ii-520-evo.html

Or its 620 version, which of course is even more expensive, it will all depend on your current build.
 

Please take a look at this link
http://www.pctekreviews.com/Reviews/PSU_600.aspx
 
Just looked at the scores for each segment tested, the cooler master might rate highest there but only because its competition is really bad, that's why I advise to better save and get the Seasonic M12, at least if you plan to do intensive gaming, if its for only light casual gaming and mostly office use then you can get any of the other psus listed there.
 
I don't want to spend more then 5000 rupees on PSU. I will run GTX 970 on my pc. So suggest me any power supply between these three- Corsair VS650 or Cooler master Masterwatt 600 or Antec VP650P.