Aircraft Management Group....

They are pretty good---offer a daily rate to pilots+per diem. Variety of aircraft. Place is located just to the southeast of RWY 23L. Multiple hangars. Here is some some contact info....
Aviation Management Group Inc, Raleigh, NC on MacRAE's Blue Book Industrial Directory of Manufacturers

Another one is Jet Logistics. I used to do some work for these guys. Good 135 company. A lot of organ+tissue flights.
Jet Logistics Inc.

Hope this stuff helps and good luck with your search!