Its around 4500/- approx. It is also available on Flipkart. Here is the link: Antec VP650P 650 Watts PSU | Psu | Flipkart.com
But im not sure if corsair provides swap warranty as my cousin bought one corsair psu from aditya but had to face issues in getting it replaced. they told him to go to kaizen and he had a terrible experience in getting it replaced coz. they repaired the psu. so i dont think its not point who provides more years of warranty. its more about how good is the replacement terms.
I am also using Antec HCG620 and never faced any issue. prior to that i was using VP450 and got it replaced after 1.5 years

so my money goes to Antec.