Picking a new theme

Can anyone recommend a theme to fit my need?

I have been using Attitude for a long time.
My company likes the scrolling image on the front page.

I recently had a need for my employees to have access to information
as well as an area where they can add new information.
Not just a blog but also an area where I can have general resources
available to them. examples; places to find certain products in my area.
contact information for key people in school districts.
general information that can help with social problems etc….
Almost like general info board that the employees can access and change.

In order to do this I would need to have them log in for security.
I would need to be able to monitor activity and be able to delete information
that might be in violation with policy.

It seems like I need a double purpose page.
The first page having all needed info for new business.

The second page would have a log in from the first page but would
have a new navigation bar. Would require a profile and would be interactive.

Does anyone know of a theme that would fit my need? I have been searching for
a long time but I can’t tell if any of the themes I have seen would fit my need.

http://www.ensignpeakservices.org