Consulting - IntrAnet Solutions Recomendations

We're planning on implementing an intranet solution. For this project I'm just looking for a bit of consulting on solution recommendations. Prefer to use an open source technology that we can build upon if its lacking features. Not opposed to purchasing a commercial solution if it fits our needs as well. Considering Drupal with Open Atrium or ERPAL Needed features for our intranet: -Windows file share (smb) search and this might be something that has to be custom written -Dashboard (with feeds) -Forms/Document repository -Active Directory LDAP integration -Employee Contact Directory -Blog -Responsive Design (mobile friendly) -Knowledgebase Thanks,