I Do not recommend CM PSU's.
They have a name for running out quick with our kind of electricity (if you know what i mean)
.
But, I'd have you look for the following
Corsair VS550W ~ 6000Rs
Xigmatek Tauro 500W ~ 6000Rs
These two will be found easily in the market.
They are quality ones.
So dont question their glory. :{
But, theres another option for you if you dont have plans for a whole revamp for a new rig.
Then get the following
Corsair VS450W 5000Rs (only 1K ki Bachat)
I still recommend the VS550 and Xigmatek one though.