It's now great time to buy coins. Because the market is a lot down now. And for short time investment, I would suggest you to purchase these coins.

Pkt,
Mtm,
ppp,
Aion,
Eos

These are very promising coins.. And The price of these coins is slightly lower. But these will rise again a few months later when the market will pumped again. You can get more details in coinmarketcap website..