I think we should buy Bitcoin first. Institutional investments in Bitcoin continue and I think it will continue until 70000 dollars. At the same time i can recommend Litecoin, Bitcoin Cash and Waves.
Bitcoin will always comes first and that's for sure. Aside from bitcoin, my second choice is ethereum because even if its value has been so low in the previous months, but i know it will always recover because of its high potentials. Ethereum will never lost its demand from the people because as far as i know, its platform will always be very useful because of its practical usage intended for its users.