Portal/Server OR AGOL/Server
Currently running ArcGIS Server Standard Workgroup 10.1 with ArcGIS Online (AGOL) Organizational account as the portal.
Problems:
-Do not like built-in ArcGIS Server users/groups vs. AGOL named users/groups
-The separate workflow of manually adding ArcGIS Server services to AGOL, then sharing them again with AGOL named users/groups
-I will miss the unlimited number of ArcGIS Server users/groups 
I understand the solution to this is to federate the ArcGIS Server to your portal.
I understand the 3 levels of integration between ArcGIS Server and Portal for ArcGIS.
Explained here: Levels of Integration
Do these same integration levels exist between ArcGIS Server and AGOL ?
My gut feeling is to wait until 10.3 Portal for ArcGIS is released (complimentary at 10.3 with 5 named users given our ArcGIS Server Standard Workgroup license), then switch our portal method away from AGOL to Portal for ArcGIS.
However, I'm concerned about hardware capacity. Max of 3 simultaneous users, pretty lightly used.
Everything on same dual-core box - any experience with this type of setup?
Portal for ArcGIS
Designated hosting server for Portal
SQL Server Express
Managed enterprise geodatabase
ArcGIS Server
2x web adapters
Any comments/feedback?
