I can see some others have beaten me to it - Id also suggest adding BitBay to the list of stablecoins to watch. Havven is interesting but after researching them all (including the over-complicated Reserve) it seems the only truly decentralized and dynamic solution will be from BitBay.
https://bitbay.market/dynamic-pegThis is from their site: BitBays democratic voting system allows for maximum resilience and elasticity during extreme volatility. In addition, $BAYs liquid supply can also be tied to a basket of separate currencies, assets, or commodities as necessary.
Their lead dev is David Zimbeck, the same guy who created the first ever smart contract GUI so Im watching this with anticipation...