If you think Ether is steady then you should think Bitcoin is steady since they both go up and down at a similar trend haha. And Bitcoin have been able to live a long time. Every coin actually has that go to the moon potential quality. But it's most safe to invest in the largest coins because they are big for a reason.
EOS I am super fascinated with because the genius behind Steemit is behind that coin haha. I need to research it more to see what it does. Anything from the Steemit founder must be pure gold in future value! Dogecoin is a bit fun to own just for the lolz. And has a pretty interesting community. Sadly in terms of development it seems to have been slow the last couple of years.