Bitfinex was my second exchange, as per the recommendation of a friend, and i have to admit, i couldn't be happier. All of the coins i trade with are listed here, and their respective pairs are still so liquid that not trading in meta-coins stops becoming an issue. With their professional support team making sure the backend keeps functioning well, a great UI and more tools than i know what to do with, the only real flaw i can point out is that verification here takes longer than other exchangesSee full review