In the bear market is very difficult to talk about the potential of altcoins. I think the best idea is not to buy new altcoins but to keep your investment in Ethereum.
Hm, I can call Ethereum the "classic" altcoin - we all know that it is really cool. let me offer you come of the tokens, which are not as popular as ETH. These are Credits, Napoleon X, Qtum, Gladius, EIDOO, and Crypterium.