I thought about ethereum but the price went to high to fast. And what comes up, must go down. I have it on my watchlist but not before it go back to 1-2 dollar.
You are right, we really can't say anything about a altcoin, it may go up to $50 in no time but it may also drop down to $1 again.
But they are always fluctuating so that is the point of trading, when you see it is going in minus a little just buy it, and keep an eye on the market and when it goes up to plus then sell them.