3rd vote for NEM.. SIA also of course.
My core positions: BTC, ETH, XLM, XEM, SC (Sia). I buy and hold these, no plans to sell for at least a year plus.
BTC - store of value (ie, not daily transactions)
ETH - Net3.0 foundation
XLM - Solid use case/ banking
XEM - huge potential for daily transactions / could insert DASH here also
SC - Cloud storage, who doesn't use cloud storage in this day and age.