I assume that RPX is one the hidden gems. It has rather low price and will definitely grow in time. Someone say that RPX will replace NEO. It's very underestimated now, so it's a good time to buy some.
Neo hasn't even REALIZED its full potential. Neo will probably be number 3 if they play their cards right and if the chinese government decides to endorse them somehow. And then there's waves, ark...All viable platforms. EOS will also be in the game next year. If the chinese stick with their ban and actually enforce it, EOS has the potential to be up there. I have great faith in Larimer.