I've been with Ffasttrade 6 months and am VERY pleased. They have the lowest rates if you trade sufficient volume, I pay $3.32 per RT plus $550 platform fee per month. System is very fast and reliable, telephone service is great too, no waiting times.
Yes... I think $10 roundtrip is like twice as high as IB. But, I prefer it to feeding the "Great Trading Machine" T.P. is so proud of. http://www.interactivebrokers.com/index.html