There are no doubts about coins you should pick for your investments! Of course this is bitcoin and ethereum! They are two of my favorite coins ever!
Though ETH and Waves are good options, I would rather choose to invest in ETH and Litecoin. I prefer these coins due to the fact that the ratio of fall in the market price of Litecoin has been very low and have the potential to stay and survive in the market.
ETH has an advantage that it has great project and the advancement in the technology is enough to take it to the heights in the market in future. I do not decide to apportion capital for investment based on the market price but rather on the future profit.