samba - Jun 2004 - Winbind and Active Directory 2003 OR a SMB3 Trust?

I wanted to get the opinion of the good people on this list.

 My work is upgrading from NT4 domain servers to Active Directory on
Windows 2003 servers. I currently use winbind to integrate in my Linux
samba servers (They do file a print well). In your opinion, should I do
the same approach with he new domain? Or create a separate samba 3 domain
just for my Linux servers, and then trust the Windows AD domain?

Have people out there gotten Winbind to work with Server 2003 AD?

Any help would be great!
-Chris