@Matthew Fitzgerald make sure to do your homework. Understand the industries in that market, talk to local RE professionals. They'll know if a new industry is coming, a new hospital being built, Google building a campus. These gives you indications of potential growth of that market. Also, one of my biggest pieces of advice is once you've decided where you plan to invest, take a trip out there. Set up some meetings with the RE agent and PM that you've settled on. Have the agent drive you around the area (the right preferable agent will gladly take some time out to do this); drive the area yourself. Get a sense of the neighborhoods. I find that no matter how much research I do online, nothing beats seeing it and 'feeling' it yourself.
I've been managing investments out of state for a few years, and it's a great strategy for those of us that live in expensive markets with low cap rates. But, I'll reiterate, DUE DILIGENCE; it's a key step in mitigating your risk.