Any recommendations for document management software?

I've just started researching document management software. We are a small government contractor with lots of short term work. In order to manage workflow, I think a system that allows for Project Managers to submit a request (for an NDA, Teaming Agreement, Consulting Agreement or Master Subcontract) and then allow us to track status (requested, drafted, fully executed) within the company would be more efficient than our current email based system. We have a sharepoint system that ideally this would integrate with.

Thank you!