I wish to start using google contacts.
Right now, it has almost a 1000 e-mails, and it's a mess.
I would love to know of any suggested extensions (online/offline) for google contacts that can enhance and ease my transition.
I think what you need is a service to manage your contacts and feed them into Google Contacts. I use MemoToo to manage all of my contacts and to make sure I do not have dups between losts of services including Facebook, LinkedIn and others.
You can read my post on how to make sure all your contacts are in sync.