i have experiance with many firms initially i find charts of sharekhan to be faraway better. for brokerage negotate hard to let them come to 2 to 3 paisa.
if volume high go with rkglobal 999pm plan or
www.halfpaisaonly.com
rememembre in mkt it is said here people having money comes to deal with people having exp&wisdom and in process they have exp &wisdom & LOOSE THE MONEY. once got enough expertise all brks will give u best terms they can bcome profit sharing & without brokerage too. anyway for starters go with sharekhan and try to learn hard . best of luck.