Well there are many but I would say NEO and QTUM among the top coins.
The Neo ecosystem promises a smart economy that will help shape the future of blockchain
Indeed, NEO is quiet undervalued today because it offers great technology. Also include XRP and NEM on your list because they are the giant thats undervalued today which can give higher profit for you in the future, better to hold some of it.
What about some coins form recent ICO? For example ENG from Enigma? Strong team work hard. Much plans in new year. Big and smart community. Why not ENG?