MtGox, Bitstamp, BTC-e. Actually I try Bitstamp and its fast and easy and you dont need to provide that things like passport scan. I get my money in 24hours through SEPA payment. And when you want buy BTC via Paypal I test https://www.virwox.com you just buy SLL then you will trade them for BTC and withrawal them somewhere. But it take 48hours for new account, anyway it work.