Here are the best performing cryptocurrencies of 2017 so far - dates are from 31st Dec 2016 to May 31st 2017. Two tables showing best performing in the entire market and another showing best performers within the top twenty market cap. 
I'll save the analysis for those more competant than me! However I thing one thing we can all take note of is the exponential increases in investment in such a small time frame! I would also add to your watch lists some of the more well known and regarded coins on the first table which are continuing to perform and show steady growth.
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