With the current market I'd suggesst investing in big altcoins, that are at a low point right now, e.g. NEO.
Coins with a use case will often be back at high prices in some time, while investing in a new altcoin without a use case could be your downfall.
There are some projects that are promising though, but always research them yourself before investing nad check the current price (maybe it's overpriced right now):Quarkchain, Open platform, Atonomi(, Neonexchange coming soon)
NEO is definitely a very good choice but you can also invest in the cheaper altcoins. Traditionally, they are growing faster when the bull run time comes. Pick Ontology, TRON, Credits, Napoleon X, and Gladius.