To play the devil's advocate (no pun intended) ...
Excluding the play factor, what is broke/failing in your network that having remote DNS servers will fix?
Do you really have a point-to-point WAN conx for all of the remote offices where everyone is on the same /24? Or, is each office an island unto itself and your "WAN" traverses the Internet via some form of VPN?
Unless you have an extremely small pipes to these offices that are already saturated with traffic, it would seem that you are making more work for yourself than needed.
Personally, I was fairly pissed when my network rights were reduced and they pulled all of the DHCP, DNS and WINS servers from the remote facilities I am responsible for and centralized them at a NOC. Now I just look after one file/print server per facility and with the execption of being forced to call an "enterprise" admin to get something fixed, it is actually not that bad.
Sorry if that sounds harsh, just trying to help you maintain perspective ...
