Ameritrade APEX, or ETrade Pro are the top two for daytraders. Some use scotty, and Choiceturd.

I use TDAmeritrade APEX. Happy, but i must be honest, Etrade Pro is calling my name (they have more expensive trades if i remember correct, but they include L2s for pinks, which i pay 55$ a month for)

Thanks for reminding me, gonna call TDa and see if they will lower my special price anymore. I pay 9 dollars even per trade right now, i want to pay 8 per trade