I think no matter what type of small coin you want to invest in, never exceed %5 of your portfolio, I mean if they out pace all others and get bigger than you can certainly see them grow over 5% of your portfolio yourself in which case it is fine but while buying never spend more than 5% of your investment into just one coin. I would still suggest keeping most of your lion share at big coins like bitcoin, ethereum, dash, litecoin and so forth.

I am still in love with ethereum and what it can achieve, right now there are many more new stuff used for it like companies built on the ethereum blockchain and games made into ethereum blockchain and even this new cryptokitties type collectibles thing going around. I can not think of a world where ethereum would be going any further down, it has amazing potentials and will be rivaling bitcoin one day.