My rep is going to reach 3,000 soon (2,987 at the time of this post), so I should be able to vote to close soon.  How should my flagging habits change when I gain this ability?  What should I do when I encounter a post that:

 1. is off topic and should be migrated to a site for which there is a migration path?
 2. is off topic and should be migrated to a site not listed in the vote-to-close dialog?
 3. is off topic and should not be migrated?
 4. should be closed for some other reason?
 5. requires a moderator action other than closing, such as deletion?
 6. is spam or offensive?

When should I use a flag, vote to close, or do both?