My money is on:

XBY - Xtrabytes: evolving blockchain with proof of signature protocol, able to handle +10000 TPS. current marketcap: 94m$, price/coin: 0.21$
XSPEC - Spectrecoin: privacy coin with TOR & OBFS4. current marketcap: 45m$, price/coin: 2.10$

both have potential for x100: both markets are big enough to handle a x100 raise of their marketcap, both offer a unique feature/technology.

wildcard: COPPER - Coppercoin: opensource software project. current marketcap: 175k$, price/coin:0.0021$

but only the future will tell us, x100 is not achieved overnight, you have to be able to hodl and accept dips along the way.