Windows 2000 to Small Business Server 2003 (Server 2003)

Hello All--

I am in the planning stages of migrating one of my clients from a Windows 2000 server over to a Small Business Server 2003 solution. My goal with this information request is to hopefully eliminate a lot of the unknown issues in moving over all of the server rolls (i.e. user authentication, usernames, passwords, security ID's, etc.) from the existing Windows 2000 server over to the new SBS 2003 server.  

I want to continue using the existing Windows 2000 server on my network primarily for Terminal Services (serving one core accounting application) and Web Hosting for the corporate Intranet currently in place.  The SBS 2003 server will act as the new mail server (Exchange 2003 obviously), File and Application sharing, and a few other minor networking rolls.  

I think what I'm looking for is maybe a quick step-by-step guide from someone that has done something similar to the situation I'm inquiring about.  I don't have a lot of experience with adding a new server to an existing AD infrastructure and even less experience doing so in this environment (from Windows 2000 to Server 2003).  

To reiterate my needs, I'd like to:

1.  Join the new SBS 2003 server to my existing AD domain infrastructure.
2.  Have ALL user information replicate between both servers (OS's).

I think I can take it from here.  The above are my key concerns and would GREATLY appreciate any and all information you might be able to provide.  Thank you in advance.