My choice is Elixir if all goes as planned and the devs keep up the hard work and do a bit of marketing then I think we can hit $50. I also think pivx and oyster prl are great ones as well.
Minex (MNX) for the win, the ath of minex is above $50, and its price now is $28, and it is expected to reach $50 or more again this year, aside of that, as long as you hold minex you can earn additional minex by parking it on their site.