Bitcoin and Ethereum are my favorites. Bitcoin because I think it'll get a big pump when Lightning goes live for real and I think Ethereum will get a nice pump once Casper goes live. Litecoin will continue to be a testing grounds for Bitcoin which I don't hate when it is trading cheaply, but otherwise am not a big fan of long-term holding. Ripple is a tougher one, which I'll likely discuss in future. Bitcoin and Ethereum are equally attractive to me currently - Bitcoin has fallen out of favor recently so think it's less risky right now (I come from a value investor background). I think Ethereum has higher upside if we see any blockbuster apps in 2018.