Market data for buy and hold B and C+ areas

[Andrew Hooyman]

What are some of the key market data someone should look for when targeting buy and hold properties that fall into the 2% rule in B and C+ areas?  Other than the obvious of population growth.  Basically I'm trying to narrow down certain specific cities/neighborhoods within Wisconsin to start looking into.  I have been using city-data.com and bestplaces.net so far.  Using the statistics and information found on these two sites is there any information that would steer you away from buying in a specific city/neighborhood?