your right I don't know much. I have never even traded options except for CME, CBOT and LIFFE options. I was going on volume and where best to get filled but obviously you know best since you make so many replys.
All this has been a big help. I feel a lot more comfortable with the CME. My rates are good and I can trade basically 24 hours on the system. I have been trying to sleep so that really doesn't bother me that it only trades 23 hours a day.
Are you trading futures or equities? What type of rates are you looking for and how many RT's are you doing in a month? All this will help you make the right decision on what company to go with.
I know a lot of prop firms that trade some serious size. I would like to see some of these guys try to get out of a 1000 lot emini. That could be ugly.