Etrade Pro is very good IMO....very user friendly, and free if more than ten trades per month are executed.
The odd technical issue in the past has caused the system to be down, particularly when the ASX has had days of extremely high volume, but all online brokers seem to suffer from that fate. But in saying that, I haven't noticed any problems with Etrade for quite some time.
There's plenty to choose from, and they all have their selling points...google it and see which best fits you.
