COSCA i just checked out these guys it seems a good organistaion but theres not a singles Scot on the board of executive officers or trustees so Im not sure how much weight can be given to them , they seem to deal with clan associations in america. a very interesting website, however I would look to Scotland and Scottish associations based in scotland for your clan, anything else is watered down whisky!

No offence meant to any groups or associations based outside of Scotland !!