Thanks for the suggestion! About 2 days ago, I purchased the Nokia Plugins for under 10 Euro (used Paypal to purchase) and iSync now works with my Nokia 6700. Note the purchase includes Plugins for other Nokia handset models.
Their website is
http://www.mactomster.de/isync/isync-en/
Additionally, I use to have a Nokia 6300 and for some reason, iSync required me to remove this Nokia Plugin from the list of Plugins; and once removed, iSync worked well. I have sent an email regarding the Nokia 6300 plugin not working but haven't yet received a reply.