@Asingh...
as i said in start M12 was Seasonic and HX was Corsair ... both considered one of the best for 850watts range...
only one which comes close to both of them is either Be-Quiet Dark Power which isnt available in India at all.... and CM UCP900. UCP is amazing and similar price range but it is not modular. so huge amount of wires on base of case.
@LBM
I myself little skeptical of Corsair becoz of past experiences but Silent Pro 1000 honestly doesnt excite me much.