OP didn't specify his capital base (whether he is a money bag or one with a shallow pocket) so we can make our suggestions based on that. All other things being equal I would like to suggest two cryptos here:
1. Waves
2. Tidex token
ethereum, if my recommendation is safe even if the price increase has started to slow. its safe because almost 90% ico manufacture using ethereum platform, so ethereum in my opinion is still good enough for long term.
Yes, we know all that. But ethereum is over used and very expensive now to acquire in quantity. Of what use is a coin's profit when one doesn't have it in large quantity.