Viacoin
Lunyr
Zcoin
smallcap coins with big potential great teams alot of updates DYOR
I like the idea of small cap with big potential. That would be a bigger risk, but the reward can be great
If you want your money x2-x3 invest purely in top10-20 coins the real gains are in the hidden gems these days in my opinion not saying that x2 or x3 your money isn't alot but I think if you want to hit it big smallcap coins with good ideas active dev teams and solid development are the way to go and HODL that shit
Potential of Zcoin and Lunyr I know, very well and road map very promising. Zcoin in next time will use MTP for mining, maybe in November or December 2017, this protocol will using in system Zcoin and the price of Zcoin in that time will increasing many more now