Help moving a Data Center

I have local office where i have my Users and servers, I would like to move
my current 2 node exchange 2003 cluster to a new data centre (New IP address
range).

Can i just physically move the server to my rack space and repoint MX
records etc or reinstall Exchange on a new Server in the data centre and
migrate the mailboxes?

What happens to the domain? i'm thinking of adding the new IP Range to the
existing AD site or do i have to create AD site so users get authenticated
from Local office GCs?

Will the exchange Cluster survive changing its IP address and will it be
able to talk to the GCs after changing their IP addresses, although DNS will
be updated??

Do I need a domain at the client site as they only access
fileservers/printers locally.

Thanks