I guess I won't really know until I own more than one Aussie, but right now I'd say Aussies are it. I love Journey so much and her traits just mesh with me so well. I seem to compare, however unfairly, all other dogs and breeds to her and Aussies in general now. Even the breed I thought was my forever breed (Tollers) isn't anymore thanks to Journey. That said, I do think there are other breeds I would also enjoy. I just always want to have an Aussie or two with those other breeds. I am pretty certain that one day I will have some.kind of Belgian, perhaps still a Koolie at some point, and surprisingly after knowing one, I think I would actually really enjoy a (race bred) Whippet. And who knows what else life will bring me. But yes, right now, Aussies are definitely it.