depending on how much u want to invest in the 3-4 coins for your portfolio, i'd suggest:

- Via (Segwit almost active http://segwit.viacoin.org/ )
- XVG/Verge ( privacy based cryptocurrency with a solid roadmap yet pretty cheap.) buy ~2 million, hold for long term.
- Shift (aiming to create a decentralized Web)
- Stratis

sadly i only had enough money to invest in via and verge.