I am not sure probably bitstamp or mtgox. I use bitonic (the Netherlands). However it has a payment delay of one day. So if you have 6 coins, you should trade 3 maximum per day. If you do well enough you gain 80 euros a day. For me this is more than enough.
Don't use gox. Sucks as almost everything. Can't get your money out. Very high transaction fees. Use other eXchange
I see people saying this all the time but I wonder how much truth there is to it? With that volume surely everyone can't have problems with withdrawing. Regarding the fee's the seem to be the same on bitstamp?
If people say it all the time its quite likely to be true isn't it? Or do you think there is a massive conspiracy against gox?

Well I have been on forums long enough to know how things go. Have you been affected by it? The poster I quoted?
I'm not trying to defend mtgox, as a matter of fact I am gonna get verified on stamp or btc-e and trade there instead. It was a genuine question.