Great topic for a post. I like several quite a bit. I'll stick with my 5 alt favorites:
XRP although it's hardly an alt coin anymore. When it's added to Coinbase, it will take off once again, even after going up 10x over the past month. I know may are still skeptical of XRP, but banks are implementing Ripple which will help power it.
FUN: Good traction and very nice growth. This should be one of the leading cryptos in gaming.
I also like POE, MTH, and Agrello
Not familiar with POW or Agrello, what do you like about them?