Most trusted exchanges in order:
1. Bittrex
2. Poloniex
3. Binance
4. Cryptopia
Note: those exchanges safe, buy isn't fully safe as you think, use exchanges only when you are trading.
PayperEx?
www.payperex.comWhile prices for Bitcoin are skyrocketing and other digital coins are out of reach for most people, The Paypers remove the cost, trust and user experience barriers associated with making these investments.