Best Practices for AD Import into FIM MV

 I'm working on a project which will require AD users to be imported into FIM and then be shown in the FIM portal. I know I could import users from a specific OU, but what I'm not sure about is how FIM and the MV keeps track of users.

For example:

I configure "john.doe" in OU "London" and then import the account into the MV.
john.doe is moved into the Hong Kong OU and I run a delta sync - can FIM track this change?

Would I be better off using an anchor on objectsid to deal with user account moves and users changing names\logons?

Thanks