I think ethereum will be a very good coin to hold during 2018. I am guessing that the price will be about 5000$ at the end of this year.
In 2018, the trend of ICO investment is growing, demand for Ethereum to buy ICO will increase so I think ETH will have a very large trading volume this year. I believe ETH can reach $ 20k in 2018, I'm buying more ETH to invest in the ICO projects that I have analyzed.