I've been actively shopping around for brokers. IB, at least on this site seems to have the highest ratings. The most common knock against them seems to be their customer service. However, most of the posts are fairly old. Does anybody know if these guys are still as good as everybody says they are and have they since improved their customer service circa Phone Support and such. I must mention that I was disappointed when I contacted them over the phone about opening an account with them. They were not too forthcoming about providing information to prospective clients. They also have a cut-off time of 3.50 pm ET where they will automatically liquidate necessary portions of some or all of your securities if your money used for the day exceeds your overnight buying power. Needless to say, I wasn't too thrilled with this rule considering that the last trading hour of the day does provide quite a bit of liquidity and truncating particularly the final 10 minutes is a major disadvantage. Finally, unlike most other brokerages they don't accept mutual funds as marginable. They only accept cash and stocks for purposes of calculating margin. However, their rates seem to be the cheapest in comparison to the rest of the competition. If their executions are as blindingly fast as most people on this site seem to indicate, then they may be worth a try notwithstanding the obvious drawbacks.