I'd stick most (60+%) in stable coins like BTC, ETH, LTC. For the remainder, I would personally make "function or platform" bets. So I'd pick a security orientated coin (e.g. ZEN), an exchange/marketplace coin (e.g. OMG), a "blockchains for everyone" coin (e.g. LSK) and maybe one other wildcard or hedge (e.g. a competing security coin like XPSEC).