I am with both Sharekhan and SAS. The cost of 1 L Eq turnover is 39 in SAS and 83 in Sharekhan, incl all charges. While Sharekhan has a slower platform, it is more robust. BTW, Sharekhan is slower by 1 sec, and I really don't need a platform with millisecond speeds for the cash I trade.
My trade strategy & MM handles the additional 44 Rs. as costs well. At least, I don't face these crippling issues while trading.