Both the DC59 Animal and DC59 Motorhead have recently dropped by $100 on Amazon.
http://camelcamelcamel.com/Dyson-DC59-Animal-Cordless-Cleane…
http://camelcamelcamel.com/Dyson-DC59-Motorhead-Cordless-Vac…
Shipping to Australia is $33.10 US. I'm not sure if this is the norm but I have a vague memory of checking shipping to Aus a week or so ago and they either didn't do it or it was extremely expensive.
The DC59 Motorhead is a new model that hasn't yet been released in Australia. It is apparently identical to the Animal except for a different beater head that is powered by an internal electric motor rather than air flow. This increases brush bar power by 75% (according to marketing specs), at the cost of slightly reduced runtime and suction (according to online reviews).
I'm not sure how the US charger differs but I presume it is multi-voltage capable and will work with a simple plug adapter.
Hope this misses doesnt see this post