I think mincoin is safe bet. This coin has low marketcap and easily can make x100. New devs taking care of this old coin and it gaining volume now, probably will grow to 100mil marketcap after it hit more exchanges.

https://coinmarketcap.com/currencies/mincoin/
https://tradesatoshi.com/Exchange?market=MNC_LTC
https://tradesatoshi.com/Exchange?market=MNC_BTC