Upgrading from NT4.0 to 2003 Server

I have 3 servers, 2 of them NT4 and 1 Windows 2000. One of the NT4 servers is currently the PDC. The other NT4 server is the BDC. I want to totally replace it with a new Windows 2003 server, using the same name and IP number. At some point, I want to start using Active Directory. Any recommendations on making this upgrade?