Migration of AD 2000 to AD 2003

Dear Sirs,

Could you comment on the scenario below regarding migration from AD 2000 to AD 2003, to new hardware.

Current Systems:(windows 2000 server), in a single domain environment.

Server A, is a DC, with DNS, DHCP, WINS installed.

Server B, is a DC(holds all 5 FSMOs roles),installed with Exchange System Objects(to create windows users and mailboxes), used for file-sharing as well

Server C, is a member server, with exchange 2000 installed.

Now I would like to migrate over to 3 new hardware, that will run on AD 2003. and the new Exchange2003 server will remain its old name.

Any tips or advices.Thanks.