Bitcoin is alway the first option for me, for alts, mainly I suggest Ripple, Monero etc. I am keeping mainly to the top currencies that have already developed products and are working to expanding it rather than on the ICOs that have solely and MVP. You can find my main 4 coins below:
Bitcoin
Bitcoin is the single largest and most recognized cryptocurrency in existence.
Stellar Lumens
Stellar Lumens is a similar technology to Ripple, however, instead of focusing solely on the banks they have built a system to integrate merchants, banks and the general population.
Historia
A novel idea. To keep current happenings on the blockchain. To ensure that in the future third parties politicians and etc wouldnt twist facts based on their needs.
Monero (XMR) privacy enabled by default. There will always be a demand for an anonymous channel for commerce.