Guys, in today's scenario there are so many brokers and everyone has something special to offer in terms of plans or services. If you are trading smaller quantities, you can try the gazillion full service brokers available - I have an account with 9 of them.
However, considering the title of the thread 'low brokerage for F&O' it is a nobrainer to decide who the best broker is. Undoubtedly, my vote goes to Zerodha - not just for cost but also for the opportunity it creates for you as a trader. There is no advance brokerage commitment, there are no catches whatsoever. You just pay for what you trade. If you don't feel like trading, don't trade. Simple.
Go with Zerodha - Discount broking is not a concept anymore in India - It's a reality. Profit from it.