Upgrade and move the Domain Controller

This is a double task: At the moment I am using SBS2003, which I plan to upgrade to the standard versions by applying the transition pack. At roughly the same time I need to Physically move all of the services/applications of the SBS (which includes exchange, DNS, e.t.c.) onto a new machine becuase the one it is on is about to die. The questions I have are: 1: Should I move SBS to the new box before applying the transition pack, or 2: Should I apply the transition pack then move the services/applications? Also what is the best way to move the Domain Controller and Exchange to a new box? I could bring on line the new box, promote it to a DC so that AD replicates, move DNS over the network which leaves Exchange, e.t.c Is there a simple way of doing this such as simply restoring data to a new server from a backup from the original machine. For all intents and purposes I want clients to see the new machine as if it was the old one. Any thoughts would be appreciated.