ETH is up there. I think it has major scalability problems and the solutions offered are vaporware. But they are incredibly good at marketing and their ecosystem is sucking up so much developer talent. It's obviously got a future despite its flaws.

LTC is also going to be a top coin, not because of fundamentals, but because it is firmly entrenched in the ecosystem already (the Chinese love it) and is seen as a test bed for BTC.

I'm up in the air about BCH. From a speculative standpoint, it really depends how much money Bitmain is willing to pour into it. XRP is up there; it's the centralized banking coin and will get a nice pump eventually.