ARD or DS for deployment over WAN?

Hi, I was hoping to get some advice on best practice for a particular scenario, any input would be appreciated :-)
Scenario
We have two sites, site "A" and site "B".
We have a server at both site A and B.
Site A is our primary location - all clients / server reside on a LAN - management is very straight forward.
Site B however, is located over 40 minutes away and is accessible via a WAN. 
I use a combination of tools for management at site A, including DeployStudio, ARD and OS X Server 10.9, however I now have to start managing both sites.
1) When using ARD at site A, is it possible to direct clients (at site B) to a local repository, rather than transferring huge packages over the WAN - which seems to be exceptionally unreliable?
2) Is there a more effective way of doing this, would DeployStudio or similar product be a better tool for this job?
Thanks

ARD itself does not have any repository at all not even for a single site. It works by you browsing for and pushing the package. As has been pointed out this does not work well for a multi-site situation.
For a multi-site situation your options would be to use -
Munki,
Simian,
Casper JDS
Simian can be considered an extension of Munki with more support for a geographically distributed setup.
Casper can have multiple JDS servers and the master can feed packages to additional JDS server with at least one being located at each site. I feel Casper would be the easiest to get running but unlike the others it is not free.
DeployStudio is something else entirely but it also has the ability to have a master server and slaves that sync to it.

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