IMO bitcoin-trader is the way to go. They have convinced me they are for real with their sponsoring of bitcoin events and the current bitcoin car making it's way around North America.
https://twitter.com/BTC_Traderbadbitcoin.org is on the fence about them last I asked them. Badbitcoin.org says
https://cex.io and
https://scrypt.cc/ are the only sites they trust.
btc.sx is there if you are into derivatives trading