Bitfinex charges lower fees than bitstamp. The Chinese exchanges like houbi and okcoin don't charge any fees at all for trading. They look like they have higher volume than the exchanges that charge fees but most of their volume is from high frequency buying and selling of the same coins by bots.
Thanks guys! I've been trading on Coinbase but my problem is that the USD wallet isn't available in Florida. Everytime I want to sell I have to cash out, eat 1% in fees, and wait 5 days for the money to deposit. When I want to buy I have to eat 1% again and wait 5 days for the coins to post to my wallet. Very inconvenient!
Yeah, Coinbase sucks for speculating/day trading, and they don't offer any altcoins. And there are so many other issues with them as well, including closing your account for reasons that include gambling with the coins you buy.
Stay far away from Cryptsy and I hoped I'd never have to say that.