That's probably all you need as far as altcoins go unless you really want to get into some of the riskier stuff, and I would not advise that if you're not a gambler.

My pick would be Neo, because if you're holding it for the long term you're at least earning some income while you hold it.  The same cannot be said for PoW coins.  I like staking coins as a general thing, but some of them have too much downside risk.  Anyhow that's the only one I'm going to recommend as I don't want to sound like a shill.