One way sync to iTunes from iPhone 3GS

I have an iPhone 3GS with a version of iOS that dates back to November 2011 (the version prior to icloud).  I will update the OS once I have undertaken a few tasks on the phone.

Upon a recent sync with my iMac (after 6 months of non-syncing), 25% of my contacts were changed.  In fact, a lot of rubbish contacts that I deleted FROM the phone have now been copied back to the phone from the iMac.  

I often prefer my phone to be the master keeper of all things and overwrite what is on my computer when syncing.  I need to now the following:

1. How can I delete all the contacts from my phone so that I can download a fresh version which I have synced with an app called Contacts Keeper where it stored all my contacts in Drop box.  

2. How can I then ensure that the "fresh version" on my iphone then overwrites the version in my iTunes account on my iMac?

Thx.
abdb469Asked:
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MBobrekCommented:
There is not really a forced "iphone to pc/mac" sync here.  Data on the iphone typically will retrieve data from the computer (or cloud storage of some sort).  The most elegant way that I can think of is to wipe all the contacts from the MAC and iPhone.  Now, it MAY be that you actually have to reset the data on the iphone to make sure this completely starts you at the bottom.  Once this is done, you can redownload the Contacts Keeper app and reconnect it to your dropbox account.  At that point, it seems that just importing the contacts to your address book on the mac would work.  

I am not sure how the app handles syncing back to your mac, or if it just handles an import as vCard.

Added info:  After reading about the app, it appears as though this simply backsup your native iphone contacts.  Wipe all contacts on both devices, restore from Contacts Keeper, then resync.  That should do it.  By default, this is the Address Book on the mac
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abdb469Author Commented:
Ok Ive just downloaded an app from the appstore which allowed me to delete all contacts on my iphone and then used my other contacts keeper app to then restore some 700 contacts (after it deleted some 1200 previously).  

If I was to sync this with my mac now, would it copy back the addition 500 or would it "see" that I deleted 500 and therefore not want it back again?
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