I only own one cryptocurrency... Bitshares.
Within Bitshares I own separate derivatives (called SmartAssets) which are equal to the value of Bitcoin, Gold, and Silver. Along with some main chain Bitshares tokens for when the decentralized exchange picks up steam and value grows.
Try out the new Bitshares 2.0 wallet here (you will not be disappointed):
https://bitshares.openledger.info/#/I plan to expand soon into some riskier plays such as a CryptoNote coin, decentralized programming language coin (ETH), data storage coin (Maidsafe/StorjX), and more. I will only invest in cryptocurrencies that are innovative and provide useful services or features.