Please check Interactive Broker's Traders Work Station (TWS) and their new competitive pricing for NSE only. I think it's attractive and very much affordable now.
IB v/s Z
Well if you are planning to make 1L from 1K by day trading, then IB is not for you as they don't provide that much leverage. Having that said you can still effectively day trade using IB's TWS compared to Z's KatiPatang (Kite). On the contrary if you Swing using F&Os, you will simply love it. TWS is pure and beautiful. I think no other broker in India provides the tools which IB provides at this price. It's a steal !
Just informing you, your turn to dig deep! U'r welcome.