I suggest to add Monero, Cardano and NEO becuse it has a good team and supported with big community. I also encourage yo to do your own research before buying certain coin to avoid or lessen the risk of getting lose.
You can also add to this list NEM, Ethereum and Zcash. The latest one (Zcash) is the coolest alt for me as it is mined well, has great anonymity and it is always in demand. Thus I think this crypto will be constantly growing.