First, you have all your contacts in Outlook, right? If you wipe out the address books on the blackberry, and then re-sync, you'll be good, right? If so, then run DM 6, conntect you blackberry, and do the following:
In DM 6, click Device up on the top left, then click Delete Data.
Now click the radio button for Selected Data, and select all the address book items.
Check Backup before deleting.
Click Delete at the bottom of the window.
After it is done, re-sync with Outlook. Pay attention and make sure you don't delete your contacts from Outlook.
Caveat: If you don't figure out what you did that added the extra address books, they are probably going to get recreated. I think you must be running some app that creates them, or you are sync'ing with an online address book somehow. I don't do it and never have, so I don't know really what you might have done.