I am looking to deploy some new software to all the PCs on our network. We currently have 14 offices, each office has a DC  / FP Server. We Run XP / Vista / Win 7 clients, the software comes in 3 Flavours XP, Win7+ 32bit,Win7+ 64bit. Rather than deploying the software from 1 central server I was looking to copy the software to a local folder on each of the offices DC's  and have the GPO deploy it from there when the user logs in.  

I thought I could get away with 3 GPOs one for each software version and use WMI to deploy the software to the relevant OSs. However I cannot see a way to deploy the software unless I have 42 GPOs 14 offices x 3 different GPOs. I thought I may have been able to use the %logonserver% in  Computer Configuration> Policies> Software Settings > Software installation but it appears I have to specify the actual server.

Does Anyone got any idea how I can get around this, or have a better solution.