Quote from blox87:
May change brokers next week. I'm at mirus right now with 2.25 per side plus exchange fees but I see that Interactive brokers is .85 plus exchange fees. Every little bit helps , does anyone have anything negative to say about IB that I should be aware of?
When market volatility increases (like on May 6) IB dramatically raises margins. With good capitalisation like yours it isn't an issue - just something to be aware of.
Also give a try to TWS demo. Some prefer 3rd party order entry software.