Best setup scenario?? Two offices, two states, running 1 DC right now? Has to be a better way.

Just got a new client.
Scenario:
Office in one state (state A)
Office in another state (state B)

state a is main office with Server Enterprise 2003 dc and files using comcast business with static IP going through TZ170 and vpn tunnel to state b

state b is secondary ofice with another Enterprise 2003 Server and is only a file replication server using DSL with static IP also going through TZ170 and vpn tunnel to state a

Main Problems:
Loss of internet connections on either end or the dc going down renders state b's office completely useless.  They can't even log in and authenticate nor can they still surf the net if it is only down in state a.  

File replicaton from state a to state b is run on a nightly basis, but not very reliable using 3rd party software.

What would be the best way to keep both offices up if there was a break in an already not so reliable internet connection or the only dc in state a?
andlemirAsked:
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Burns2007Commented:
Promote server in Office B to a domain controller (using dcpromo.exe), and set that domain controller as a global catalog.

That way those users will locally authenticate to that server even if the link to site a is down. by making it a GC it shouldn't amtter if the server in site A is down either (as long as it's not more than 60 days...but you'd have much bigger problems at that point)
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Burns2007Commented:
If you have two domain controllers and 2 AD sites...you can use DFS to replicate shares between the two servers. However if the link is as flakey as you think you are going to have problems with any replication software
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andlemirAuthor Commented:
WOW.....thanks for the FAST response!
This sounds like a good solution to me and it is what i was going for, just didn't know if there would be an even better way.  This seems to be the most feasible.

In regards to DFS though, isn't it true that its not all that reliable (pre R2 and that is what these servers are currently running) because if a single part of a file changes it will recopy the whole thing as opposed to post R2 with the implementation of FRS making things a bit more stable?
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