Honestly, you will probably not see returns that huge maybe until 2020. But you are looking for coins that highly undervalued, only focus on platform coins. Those are the coins that will have the most use cases and adoption than any other coin. So my suggestion would be the following:

Iota --- Tangle network
Lisk --- JAVA DAPPs
Cardano ---- SmartContracts 2.0 plus scalability
Neblio --- Multiple coding language adaptabilities
EOS --- Need I say more>