Fourplex Analysis Help

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Hello BP, 25-year old from Texas here and I'm itching to get into the game. Here's the first property that I've come across that seemed actually worth my time to crunch the numbers on, help me see if this is a good deal or not. Note: I plan on living in one of the units, self-managing, and renting out the other 3. My goal for a property is to live rent free, so additional income beyond that is not essential.

All units 2/1.5 townhome style, 1050 sq ft. New water heaters installed in March. Currently 100% occupied. College town and within 4 miles of two major universities, but appears to be in better condition than many of the other local college rental properties (based on pictures, have not seen in person). Neighborhood is ok, lots of similar type properties, but is not in a bad part of town. Each unit individually metered for electric and water.

Asking Price: $229,000

Gross Rents (3 units): $2150 per month

Expenses:
Taxes: -$543 (actual 2012 taxes)
Insurance: -$100
Vacancy (6%): -$129
Repairs (8%): -$172

Total: -$944

Mortgage: -$1,055 (3.5% down with FHA. 30-year fixed at 4%)
PMI: ??? How much should I estimate for this?

NOI: $2150 - 944 = $1206

Cash Flow: $1206 - 1055 = $151 - PMI per month

On first glance, it seems like a pretty break even / live rent-free deal, which is my goal. What am I forgetting or leaving out?