5-10 coins is too much for me. That is not diversification but what I call crypto luxury shopping. Prior to buying coins, you must do the research and look closely on your selected coins, 5 is more than enough and it would just stretch your funds giving you lesser profits in the future. Diversification is selecting few coins and spread your allocation in it, that way you could managee your portfolio very well.

I would bet on ETH, LoyalCoin and Ripple. 2 of the top 10 and 1 for a lowercap coin which I am looking closely into.