Just a quick analysis.
Did you know if you had taken the top 10 coins by market cap on Jan-01 2017 (https://coinmarketcap.com/historical/20170101/) and put $1000 into each of them to be held for 6 months you would have made over 1000% in gains.
A number of these coins are no longer in the top 10 market cap yet they still did well despite moving down in rank. Be interesting to see where the current top 10 coins will be by the end of 2017.