You said "I need a good quality 500 watt psu" and the Seasonic is all you could get (from flipkart). Save your money and buy it. Don't buy a crap psu because that's all you can afford right now. You'll regret it in another year when you are getting constant BSODs.
Totally agreed with i7Baby. OP pl provide some other online stores website links so that I may check them as well. Maybe you get lucky and get some best value product there. For a while consider quoted seasonic psu.