PSU for gtx 660 and fx 6300 under 3K

430W from a good brand such as Antec, Corsair, Seasonic (XFX also uses them), EVGA, or Cooler Master with 80Plus certifications will be good. 450W would be my recommendation as I do not know your other components.
 


Will one of these do adn please suggest the better one - http://www.akshatblog.com/budget-gaming-smps-for-your-pc/
 


But it has only 28 A rating on +12V and it's not recommended for gaming. It should be atleast 36 A.