I personally like the kook design with the shape of Australia in the background. Because one day, there will be a world government and former Australia may just be a state or part of (distant memory). The re-strikes are best bang for buck. Earlier kooks will eventually be harder to buy and premiums will soar in value as years past. Simple case of supply and demand. I think 2006 had the lowest mintage (76,943?). Look at a combination of low mintage, good value (low premium over spot), and lastly design.