I think the current coin that is very suitable and very good for investment is bitcoin and XRP, you should be able to see the opportunity of XRP price movements that seem to be very expensive by the end of this year.
I have that two coins and I also think that coin will increase very high again . Ripple possible becomre hundred dollars after few years and bitcoin become very high also after few years and before end of this year 2018 it will become 20k dollars more again.