I have two best buys I can see at the moment:

OPUS (OPT) - Music Industry coin (helping to give artists a fairer share of royalties for their music) - http://opus-foundation.org/
KINFoundation (KIN) - KIK Messenger's in app currency - with over 100,000,000 installs of KIK messenger this could be huge - very cheap at the moment and integration into the main app is complete with a whole host of services upcoming in 2018 - http://www.kinecosystem.org/