Very odd to read these answers from my side of things, most of what you picked wouldn't be on my list. But when I think about it all named are really cool and I find myself admiring them almost everytime I see one.
If I choose it would be your death adders. The different looks of the different species, that would do it for me. Can I pick a lizard, too? Egernia! Hard to know what kind, I've only seen depressa, stokesi, major, I would have to have a good look at all of them. There is the western blue tongue, too. And the Phyllurus leaf tailed geckos.
I've decided. What I have to do is observe and work with all of them until I know which is the right one for me. It will be a lifetime of work but I'll face up to it.
The big problem would be who would switch with me from Australia to the US? Several people might say they would. After they think about it I bet no one would leave all you've got there!