I would recommend SNGLS, NEO, WAVES, ICN, DECENT, ETC and ARK. These are just some the best names that come to my mind. There are other tokens and coins that can give good returns in you can hold for 2 -3 years. All the best!
These are good coins, he can add DASH AND XMR. BUT IN THE LONG RUN, HE SHOULD MAKE A PERSONAL DECISION ON WHAT HE THINKS IS BES FOR HIM BASED ON RESEARCH AND ANALYSIS.