I'd be very interested to exchange information with you, if you're interested. I have some information which relates directly to Vances in Australia and perhaps therefore would be of interest to you.
I'm starting to try to collate some of the Scottish, Irish, American and other overseas Vances in the hope of finally sorting out the connection between them/you and my family of Vans of Barnbarroch. You may be familiar with the work I have already done on the Scottish side of the family which can be found at
http://homepages.rootsweb.com/~vfarch and with my published paper, "The Origin of the Irish Vances".
I am co-ordinating my work as far as I can with that of the Vance DNA research project - for further details of that, see
http://www.vancegenealogy.com/index.php. I would urge any male Vances to take a look at the website and consider having a DNA test done as this seems to be a potentially useful tool in untangling the truth of the matter.
I would also be very grateful if any of you Vance descendants would be prepared to share your data with me, preferably as a gedcom file to save me re-typing it all.
Best wishes to all members of the Vans/Vance family,
Jamie Vans of Barnbarroch.