I would take a look at Aeternity, it has huge potential in my opinion with the mainnet launch in 2018 and it is still very thinly marketed. It also dropped a lot in price since someone with over one million coins got hacked and the hacker sold all the coins creating a huge sell wall. It surged already 100% in the last days again, but its still dirtcheap and under the ICO price. This isn't investment advice though, always do your own research and never go all in on one coin, spread the risk!