My suggestion is, buy these coin or token which price down now and have a great future in 2018.
Bitcoin, Ethereum, TRON, Electroneum, DeepOnion, and PRiVCY are always good for long-term investors.
I am planning to hodl many altcoins, not only Ethereum and Bitcoin. For me, top-10 tokens are the priority alts. Besides them, I do love Ontology, OmiseGO, NEM, NEO, Dogecoin, VeChain, Napoleon X, and Credits.