a few more trading websites could be
Bittrex.com
bitfinex.com
CEX.io
hitbtc.com
https://www.binance.com/?ref=15889586
i personally think the binance exchange is the best of all of the above (it has my referral code) they have the cheapest fees and the exchange is friendly not to mention it is also quite convenient and easy
you can also comment you favorite exchanges. let2s have a discussion below;)