@James L.
Buy and hold multifamily is getting a lot of attention recently in Killeen. That market is definitely trending up. Firstly, it is rebounding from '08. The crash didn't hit SFHs in Texas much, but MFHs hard because so many were owned by Floridians and Californians getting squashed elsewhere. Killeen fourplexes in particular had their values cut in nearly half as there was a foreclosure epidemic for a year or two. But now price have almost returned to what they were before.
Also, the white hot Austin market is driving out investors into our area, looking for buy and hold bargains that can't be had in that area. There are no duplex or fourplex foreclosures in Killeen right now, period.
I myself bought a fourplex in 2012 owner occupied (FHA) and have been happy with it. There are some areas with fourplexes I wouldn't buy into whatsoever, but other areas I do like and keep rented well. I like the SW side of town for multi-family and buy and hold - there is a lot of new commercial development on that side including the new Wal Mart and Texas A&M campus.
For property management, there are some good forum discussions on BP on whether to do it yourself or have someone else do it. My own thoughts are - stick with your core competency. If you enjoy doing PM and are good at it, do it. If you plan on making money flipping or searching deals, then have someone else do it. After x number of homes, PM is going to be a full time job and a tether on your life, so you'd better enjoy it, a lot.
Call me if you want to talk more about multi-families. My post is getting long, and a lot depends on your circumstances, of course!