Honestly, LTC seems like a good bet these days. Last year it was the biggest gainer, $100 investment would have become $30000+ between Jan and Dec. It seems to be getting picked up as some sort of MasterCard to Bitcoin's visa with retailers. People are making ASICs for it, we saw what that did for BTC's price. I don't know for sure but it seems to be getting some what popular. I mean it might not mean huge money for you, not like if you have two BTC of DOGE and it hit $1.00 but LTC is probably a better bet long term. Honestly I would take one of those BTC, break it up and invest a little in a bunch of long shot currencies. You will lose on most of them, maybe all of them but you have a better chance at coming out ahead than if you plop it all on one square. I would keep the other BTC for a while more, why not right? It looks like Wall Street might be moving in, one BTC could become worth a bundle.