Best practice for lots of DP's over slow links

Hi All,
We have an established environment consisting of 1 primary server (with separate SQL server), 10 secondary sites and (potentially) 2000+ sites, each with a DP.
Currently we have all the DP's in place as push DP's with rate limits set between 1% (daytime) and 75% (night time) to throttle the traffic. All but 100 of the sites are on variable links that vary between 2Mb and 16Mb depending on the traffic
needed. The 100 other sites are on very slow links (<1mb).
Network utilisation hardly ever exceeds 50% of the available bandwidth in normal use but can burst to 100% on rare occasions
We are concerned about the load on the primary server when deploying applications to the 2000+ sites, it takes a long time to get the application to all the DP's.
I have been given the task of re-designing the environment to meet the requirements:
SCCM traffic cannot block or affect normal network traffic (financial info etc)
A critical patch to the OS must be deployed as fast as possible to ALL DP's and then to all clients
A large deployment (>1GB) must not block the deployment of smaller but higher priority packages
My reasoning is that if I were to set the 2000+ site DP's to be pull DP's with the 10 secondary sites as content locations (prioritised to the secondary site each DP reports to, then any others) then that would meet points 2 and 3.
Point 1 is the sticky one... Normally I could use rate limits (as now) or pulse mode to limit the bandwidth used between the secondary site and the DP but a pull DP cannot use anything other than BITS.
What would be the settings for setting up BITS?
Where would be the better area? client settings (requires client on the DP) or via GPO?
Any suggestions as to preferred limits to set in BITS?

If your DPs belong to secondary sites, then there is no load on the primary site server to distribute content. Content flows from the site server that the DP belongs to which in this case are secondary site servers.
You will never prevent complete network usage using built-in software facilities. If those are your requirements you should discuss QoS with the network team and/or check out one of the two alternate content providers (and eliminate all or most of your DPs):
Adaptiva OneSite and 1E Nomad.
Jason | http://blog.configmgrftw.com | @jasonsandys

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%

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