One more point -
Instead of "% based charges", better go for "per transaction based charges"... otherwise they will suck your money, since it is charged based on the overall transaction amount, irrespective of whether one makes profit/loss.

Do also check RK global.. which is charging Rs.9/- per transaction...
Charges Schedule
Brokerage Rs. 9/-* per lot
Exposure against margin(Intraday) As prescribed by NSE or 15% whichever is higher.
Software Maintenance Charges (Web Version) Rs. 99/-* per month per segment

Software Maintenance Charges (Diet-Odin)# Rs. 299/-* per month per segment

http://www.rkglobal.net/Services/WhatWeOffer.asp