Introduced '03 Standard and '03 Standard R2 Domain Controller into our network

I recently introduced a Windows 2003 domain controller on to our network. Let's pretend that my 2000 domain controller I retired was named "dc2000", and my 2003 domain controllers I introduced into my network are called; "2003dc1" and "2003dc2". Before introducing the 2003 domain controller(s) on to my network I followed this kb to take the proper steps in introducing a '03 DC into a 2000 native mode network: http://support.microsoft.com/?id=325379. I transferred all FSMO roles from the "2000dc" DC  to the new "2003dc1" server. I moved dns, and dhcp to "2003dc1". I de-promoted the "2000dc" from being a DC. I removed it from the network, and re-imaged it with Windows Server 2003 R2. I ran an adprep.exe /forestprep to prepare the domain controller for the upgrade.  I ran it on the server that is the schema operations manager with the Adprep tool that comes on the R2 product CD in the \Cmpnents\r2\adprep directory. After this was complete I promoted "2003dc2" to a DC.

Now that I have established the history of how I got to this point I am getting ready to raise the Forest and Domain Functional level to Windows 2003. I am not getting any relevant errors in event viewer on my DC's. I was doing some research to look for any possible issues before I raise the Domain and Forest Functional levels. I noticed a couple of things that I wanted to verify I could delete or edit with the correct domain controller.
In ASDI edit when I right click on my domain and then left click on properties and  then scroll down in my attribute editor, I see that my "domainreplica" is being listed as my old 2000 DC named "2000dc". I believe this should be the "2003dc1" server. Can I edit this to the "2003dc1" server or what is your recommendation? In Active Directory Domain and Trusts when I scroll down to "Sites", "Services", and "Netservices" I see that the "2003DC1" is listed by IP address. The "2000DC" is listed by name in "Netservices" as well. I want to verify that I can simply delete the "2000dc" entry. I also would like to know if this is normal that the old 2000 server was left in these places. If it is not normal please give me a suggestion why this could have not been removed.

Thanks in advance.