I think you should spend 25 percent to buy bitcoin ,25percent to ethereum, 25percent to buy other cryptocurrency and 25percent to buy a very good ICO.
It's not important to invest the same thing all through and if I were the one I will just invest 30% on good ICO and 35$ each on ETH and BTC which I believe in most.
Good thing to spread your investment into other coins from 3-5 to avoid losses. It don't need to have a lot of coins to invest then, as it could really hard to manage them all especially if we aren't in full time crypto trader.