Currently have a Duplex FHA loan. Now what?

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I purchased a Duplex in June of 2015. It's in Milwaukee, Washington Heights zip code 53208. I'm now looking to build my portfolio and investigating financing options. Come January I will have a down payment for my next purchase. If I am interested in house hacking would I be eligible for another FHA loan if I were willing to move into it? If so, would I have to refinance my current mortgage? If I don't do an FHA on my 2nd duplex what are some other options people have had success with? I will most likely have 20% but is a standard loan a good option or should I look at other options? Does anyone have someone in the area to discuss HELOC options and to find out if that might make sense?