No Disrespect Intended...
Do I understand this correctly? You're going to go to the Internet and ask a bunch of strangers to design a security program for you?
I know that most of us have a very high level of integrity and very strong ethics; however, in this case... go hire a bonded company to do this work. The bond helps to ensure that the work is of good quality and helps to protect you, your employer, and the development company from any damages that a security breach would entail.
If all you need is simple network monitoring, then goto
sysinternals where the work has some degree of open-source peer review and has the basic tools any network admin should keep on a protable drive!