maybe have a look at Zcash,Peercoin and even,forgive me Lord,Bitcoin cash?
ZCash is a solid option. Anyway, I would limit it to not more than 5 different coins, because more coins=more work for support=slower answer...
What do you mean zcash is a solid option? I think there are always other coins that be better than zcash but you chose zcash. Btw by limiting your coin into 5 coins is a good thing but to think that if you apply more coin, then you must need a shapeshift so it does not bother your support. I think this is really a good way to keep your support be active and you can apply more coins too
zCash offer one of the strongest privacy protection, something useful for some people who wants to bet on a casino. I mean, you can say XRP, Cardano, NEM (or any other) are "better" or "more useful", but their advantages can not be used in the casino.