Alts are very very risky, and the four below are no exception. However, I think there is a lot of potential upside for them.

1. NMC - I can see this coin rocketing 5 years from now, its simplicity is its strength

2. DOGE - say what you want about this one but has a community and it is being used, and far more compared to even Bitcoin when you account for the market cap.

3. NEM - seems very innovative

4. HUC - a solid human mine-able coin. Might not be worth much in the long term but it's a good short and mid-term gamble, very innovative