Member Management Plugin Suggestions

I wanted to get some opinions & suggestions before I get too far into digging through all of the available wordpress membership management plugins. There are so many out there and they all have their own special niches.

What I am looking for is a plugin that can control where people can and cannot edit inside of wordpress. I’m going to be creating a site for a large organization and each department needs to manage certain areas but I also want to avoid giving them access to places they should not be in.

I know wordpress has a tools built that help with this but I would like to narrow them down to specific pages or even sections if possible. I wasn’t sure if their was a special name or phrase that may help bring better results when searching.

Any and all suggestions will be greatly appreciated!

Thanks,