I wrote a post a long while ago which started as question in on Technet Forum on how to remove a computer from a collection using a status filter rule once the OS deployment Task sequence is successful, I posted the script here: http://ccmexec.com/2010/03/remove-a-computer-from-a-collections-when-osd-task-sequence-is-completed/. I still use it in almost all of my implementations of Configuration