I am fishing for one myself because I hate what I have to pay with TDW. Here are the links of reviews of some brokerages:

http://financialjungle.com/2007/04/08/general/save-thousands-with-interactive-brokers/
Save Thousands With Interactive Brokers

I think this is very important for those who trade US stocks. (the above post)

http://www.milliondollarjourney.com/review-canadian-discount-brokerages.htm
Review: Canadian Discount Brokerages

http://www.redflagdeals.com/forums/showthread.php?t=350256
Questrade $4.95 per trade, no fee RRSP, no inactivity fee

After reading the above posts, I have four candidates left: IB, tradefreedom, questrade, and CIBC. Since I am concerned about the expenses in foreign exchange, I am very likely to choose IB. CIBC is very attractive to me because of the 50 trades/$395 deal, and I can buy mutual funds there.

Any suggestions?