OKC Property Manager Needed for 130 Unit Apartment Building

I am looking for a great property manager in the Oklahoma City area with experience managing larger apartment buildings.  I am in the process of purchasing.  The current management company has done a good job with low vacancy, but the expenses are very high.  The neighborhood and condition of the building are both B-.  The property is located in the north west part of OKC.  Any recommendations would be appreciated.