You may be better off just buying $50 of the top 10 coins by marketcap. I saw on Reddit that if someone had spent $1000 and bought $100 of each of the top 10 coins on January 1 2017, that portfolio would've risen to $43,000 by Dec 3rd 2017. This includes the meteoric rise of Bitcoin but who knows if Ethererum or Litecoin will have a similar rise in 2018?