You can try Poloniex. Poloniex is a digital asset exchange that lets you trade securely with the advanced trading processes. The platform allows exchanging any of your virtual assets that are stored offline in a cold storage, thus minimizing the risk of hacks without compromising trading. It keeps your funds stored only for you and doesnt operate on fractional reserves like the banks do. That means, you can always sell or withdraw all of your funds without quantity issues. If I talk about stability, Poloniex monitors all activities round-the-clock and if any suspicious activity is found, then it puts an active block before matters get out of hand.
Supports: USD/ETH, BTC/ETH, ETC/ETH, ZEC/ETH, GNT/ETH, REP/ETH, GNO/ETH,