Bitstamp is a Bitcoin/cryptocurrency exchange with very high trading volume which gives you more liquidity. It was founded in 2011 and has its headquarters in Luxembourg. Expect .25% when buying and trading on Bitstamp.
They have a wide variety of trading pairs and cryptocurrencies available such as Bitcoin, Ripple, Litecoin, Ethereum and more. Although it is based in Europe, users from the United States and other countries can send international transfers for a very low fee.