I'm looking for suggestions for a broker to do high frequency (scalp) trading on the FDAX. My requirements are: 1) Want to use Ninjatrader as my order entry frontend. 2) Low daytrading margins. 3) Of course low round turn commissions. I'll be doing about 2500 round turns per month. I'll always be flat at the close and I'll always have a protective stop in covering my position. I'm in the US. Broker replies welcome.