I think still same with 2017, eth still become the second after btc. But after that we can choose xrp, xmr and ltc. I can't give you something worth but btc, eth and xmr always become my best coin and still give me income. Most people will say XRP and BCH because has amazing price action & volume at 2017 but is up to them and you as the owner of decision. But BCH is good option. Good luck to you.