I think for me the best cryptocurrency next to bitcoin is ethereum and litecoin. I have my ethereum too. if you will study the price of ethereum you can see also that it started with very cheap price. even last dec it was only 450 and became 980 somehing now. it went to like 1400 also on beginning of january vut it goes down a bit . but it is still on its high price. litecoin too I think it is also good to invest in that coin.