What takes precedence when multiple, conflicting GPOs apply to the same OU?
Solution 1:
GPOs have a link order for just this sort of thing.
"Links to a specific site, domain, or organizational unit are applied in reverse sequence based on link order. For example, a GPO with Link Order 1 has highest precedence over other GPOs linked to that container."
http://technet.microsoft.com/en-us/library/cc757050(v=WS.10).aspx