This is the a question I think everybody should do there own research but I think there are a lot of coins which will perform very well in 2018 and the future.
Raidennetwork (RDN), Ardor (ARDR), Burst (BURST), Ark (ARK), Pivx (PIVX), Sirinlabs (SRN), Powerledger (POWR), Viberate (VIB), Kyber (KNC), Funfair (FUN), Smartcash (SMART).
Don't buy them just because I tell you!!! Do your own research and read the white papers!