michal,
I am using nextrend for $79.95 a month. I wanted to use e-signal but it was too expensive since I am just starting out. So far I have had no problems with nextrend - I am using lots of charts (BB, STOCH, RSI, time and sales) and it is very flexible.
I am also trading emini-s and they let you have realtime emini's for 6 months for free and then it is $10 a month.
GaretJax