Most people are mentioning the usual suspects in the top 20. For large cap I'm quite bullish on OMG, and I'll rattle off a bunch of low-mid caps that I think have good potential through December and into 2019. Always DYOR as I'm not going into detail on a bunch of coins. 

RHOC, XSPEC, QASH, XBY, SHIFT, ENG, KMD, ITC, EVX, WAN, etc. 

If we are actually at the bottom almost any coins will net you some nice returns during the next bull run, however finding the fundamentally strong ones that have staying power through 2019 and onward is the most important factor.