I can give you some insight into this, although I am not a huge altcoin expert I do know a bit about them.

My recommendations:

1. STOX - This altcoin (actually a token) has tons of potential. The development team is spending millions to market it.
2. DeepOnion - While I do not believe there is much unique about this coin, it is the only real competitor to Monero at this point.
3. DubaiCoin - This coin already rose 400x in value. That should say enough.
4. Ethereum - I have the add this in here simple because of how much potential ETH has (it is arguably the only crypto that could feasibly overtake Bitcoin)
5. ZeroNet - ZeroNet is a WAVES token that has amazing developers who actually care about it, not only a pump-and-dump like most others.