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Bittrex is by far my favorite. Very fast. Very cheap. And its never caused problems for me. Don't store it on the exchange though. Use the mist wallet.

I don't think you can go wrong buying ether. You can also use coinbase if you want to use usd instead of btc.

Coin Marketplace

STEEM 0.18
TRX 0.16
JST 0.030
BTC 68363.69
ETH 2642.16
USDT 1.00
SBD 2.69