Ethereum was the best of all, but if you already have it, then I suggest you to buy it again. But in case you absolutely want to buy a new one, I recommend you ZCash. Its partnership with Ethereum will make it something big.
It is crazy to pick expensive coins when you can get much more cheaper one like Cloak, ZenCash, Crave, which have good chance to grow few times so they are super opportunities. Zcash can only recover previous price and this is it. Do not expect more miracles. Thinks like whales thinks, do not fall on PR.