Replicate in one direction from Primary DC to secondary DC's

I have DC's at multiple locations around the state. I need them at all locations because if we loose connectivity to these locations then the end users would still have to be able to authenticate. In the past I've had problems with DC's dying and corrupting AD and DNS and it spreads all over the state and I have a huge problem to clean up. I was wondering if I could keep all my DC's and just make any needed changes on my primary DC at HQ and have it push the changes to the secondary DC's without pulling any info from them.
DOCDGAAsked:
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Felix LevenSenior System and DatabaseadministratorCommented:
To deploy an RODC, at least one writable domain controller in the domain must be running Windows Server 2008. In addition, the functional level for the domain and forest must be Windows Server 2003 or higher.

Of cause only 2008 DC's cann be RODC's.

Full info:
http://technet.microsoft.com/en-us/library/cc732801(WS.10).aspx
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Felix LevenSenior System and DatabaseadministratorCommented:
With server 2008 R2 you could deploy Read Only Domain Controllers to your "Branches". Changes can only be made on the HQ DC's.
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DOCDGAAuthor Commented:
Would they all have to be Server 2008?
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