Should I upgrade my servers or ????

Should I upgrade my PDC to Windows 2000 first and then do fresh installs of all my subsequent servers or should I just upgrade them all. I had planned on Upgrading my PDC and then doing fresh installs of the rest of my servers and then after I havemore Domain Controllers online I would take my old PDC off line and do a fresh install of that also. Is that the best method or is there a more proven/successful method that will save me headaches and many long night?????

I appreciate any and all help you all can give me.

Thank you in advance