#4 This is very cool. It really conveys the "solid, serious" nature of the problem well. And I think I do like the slogan in there, but it can be removed as well. The Australian part I need to think about a bit more - we work all over, especially with New Zealand. It needs more Queensland in it (the pointy bit at the top on the right - there are very sensitive up there.
I like the bigger feral and smaller fund.
#7 This is good too. Could it have more dots in the sphere to allow the shape of Australia to be put in?