I would recommend Billion coin supply Top Altcoins like Ripple, Stellar, Nem, Cardano, Tron, ReddCoin and other Altcoins that already proven their market worth. These are Top Altcoins that are being proven that they need more investments because they're Big and they're goin to dominate the Crypto Market even after a decade I suppose.
These coins are priced a low as a penny so if you're going to invest today into these mentioned coins then their price after a year would never be the same as low as today hence, they're worth of investments for long-term.