I've noticed the coins with higher market caps tend to have a smaller price bump than those with a smaller one. I'm talking about the top 10 vs top 20-100 coins.
To give you an example, a Ripple bump to $1.8 equals an approximately 8-fold price increase. You can compare that to.. say XEM, which had an ATH of ~$2 and currently sits at $0.04. A bump back to the ATH means a 50-fold increase. I wouldn't look for ATHs though. I'd rather check and see which projects hold a real value and which don't. Adding to one's portfolio the first 10-15 coins that were launched after Bitcoin might be a good idea.