G'burg and 43, you're both right in that their is a lot to consider re taxes and packages. I'm not a Aus tax resident anymore, so my knowledge in that regard is limited. However my understanding is that super at least is generally untouchable by the IRS. That may change if you withdraw some of it.
Health insurance varies by employer, and there are often different packages with different costs associated depending on what your needs are. For example, I pay $340/month (pre tax) for two adults for a rock solid plan. 401k is a different beast again. It can be a match, where you have to put your own dollars into it, and your employer matches those contributions. Or it could be a direct contribution, which works more or less the same way as super.
In any case, if you're a tax resident in both countries, 43 is on the money and you absolutely need something better than TurboTax's online offering.