If you are a intraday trader and looking for a good firm and good service you may go with RK Global as you can do unlimited transaction with just 999. You also need to pay 249-299 for their software maintainace for one month. But just in case you need to do a transaction over the phone due to internet problems or power shutdown you need to pay them Rs25 per call on trade. But if you go with Religare you have the advantage of getting back your brokerage if you pay them 15k, 50k, 1L upfront and you get a brokerage of 15paise, 10paise, 1paise respectively for 1000 rs trasaction. But beware if you don't generate that brokerage within 1 year you will loose that portion upfront money you have paid them. You may choose 15 thousand to be on the safer side. Their service is good and their software is excellent. You may have to pay Rs1000 for their software. But negotiate with them to get that to half the price. But discuss the options with them and get all the charges(hidden charges) you may incur before going with them.
All the best.