You raise an excellent question, for which I can find no ready answers. That said, it may make sense to contact Microsoft Education to inquire about advanced AD courses they may offer only on the Redmond campus. Likewise, you will want to talk to the folks at SANS (Jennifer Kolde at email@example.com would make a great initial point of contact) to see if they can customize their GIAC Certified Windows Security Administrator class to focus more on the topics in which your organization is most interested.
Beyond that, you're moving into the province of high-powered AD experts and consultants, many of whom would be glad to prepare a custom couse precisely to meet your needs for a price. Here are some well-known authors and experts who might be able to help you out:
I hope this provides you with the information you need. Good luck with your upcoming AD design and deployment efforts.
For more information on this topic, visit these other SearchSecurity resources:
Best Web Links: Securing Microsoft products and applications
Careers & Certification Tip: No Microsoft security cert, now what?
Careers & Certification Tip: Raising the security bar for the Windows 2000 MCSE
This was first published in April 2002