I would split it up this way:
20% BTC - Always going to rise. If BTC falls all other altcoin will too.
20% LTC - Very undervalued. I see hugh gains in the next 1-2 years. Basically the little brother to BTC.
20% Ripple- I personally don't like it but I guess it is very solid. Hard to say if it goes up that high.
The following two are wild guesses by me.
20% AntShares(NEO) - going to be Chinas national wide used cryptocurrency.
20% Ether LBRY, Steem, Sia, Stratis (probably the most solid of these?) - look them up and decide what you like best