Best solution I have found so far...
http://smartphone.handster.com/progr...ide%20contacts
*Not only protect all messages, also protects whatever you want to protect individually.
One quick solution
http://www.spbsoftwarehouse.com/products/wallet/?en
What you would have to do though is remove the sensitive contacts from your contacts list and create them as cards in SPB Wallet.
You would still be able to synch from you PC's version of SPB Wallet but they would be able to be in either contacts or Outlook.
However they would certainly be secure.
Or Google is your friend
http://www.google.com/search?source=...earch&aq=f&oq=