Security Cameras in the MS area

I have a number of security cameras installed at a business presently in the Jackson MS area. I need to get more cameras installed and some existing ones replaced.
Unfortunately, I am not from the area and have been trying to deal with what I can find. I have had some less than fortunate dealings with contractors there and am looking for a better contractor. Can anyone suggest a good company to deal with that will warranty their work and will honor their warranty?