hey vjay,
i think the best provider in todays market undoubtedly has to be
MDP not only are they cheapest. they provide most no. of stocks including futures and mcx.
it has no time delay. most providers that offer rt data from yahoo which is most unreliable but here the speed and quality of data is very good.
also they have excellent 24 hr support which is very helpful. u shud definitly try it our. according to me they are the
Best nse data feed provider
hp this was helpful
thanks
rash