Changing a cluster name is fraught with problems, I speak from experience < grin >, moving the databases about is fine, I have 8 environments where we do this on a regular basis - if you're going to move the logins with master make sure you recreate your servers with the databases in the same dbid order.

You do need to control access carefully, especially linked/remote servers / net/com servers to make sure you don't get any environment cross contamination. We use Litespeed which means we have smaller backups to move about. Your options depend on database size I guess.

We have specific server naming so we know which environment they belong to. Database names we usually leave the same.