After trying many brokers I would say its BAD Idea to go with a ultra cheap broker.
Reasons:
Poor or Limited support
Outages on Network due to low cost of operation
Huge Loss to client in case their ODIN Trips when you have a Active Trade.
best is to seek a moderate brokerage and pay a few extra Rs. to save yourself from bigger danger.
You cannot make million by saving Rs.20-30 per trade, but you can easily loose a lot by choosing a wrong broker.