I have heard many, Augur and Golem back in Sept 2017 from coinable marketing director. Though its hard to say now with the vast movements of other "alt coins". Ripple and Bitcoin cash for sure at beginning of 2018. Probably DASH, MONERO, GOLEM, AUGUR in latter parts of 2018. Lot of steem in the EOS arena, as well as ZCASH too. Though buying Ripple and bitcoin cash on other exchanges may not be bad idea if you have accounts. Buy now, before more accounts then Charles Schawb see new wallets on coinable and want a piece of the action. Happy trails.