Personally I think that you should go for top 20 currencies listed on coinmarketcap. They are perfect combo pack of profit if considered for long terms. I mean just look at the ripple and nem coins. They had prices below fifty cents few weeks ago and they were like that for at least one year or so. Now the time has arrived when the rates have skyrocketed for them and people who inevstment into it long ago are enjoying the money.

Consider that in your mind and inevstment into top 20 coins. You can put the amount of money which is affordable to you and which you can lock away for at least a year or so. These projects work and develop very slow so it's better to wait for long after you make inevstment.

I would go for ripple which still stands a chance to go beyond expectation. Then I'm considering ADA, ETH and XEM.