One more piece of Anecdata, Im an Australian who has decided to go for US citizenship, for several reasons but all basically due to a continuous disregard for personal liberties by our government. Australians love being told what to do, seems like 90% of the population are very satisfied to be servants of the ruling class and aspire to nothing else.
Edit: I replied to the wrong comment, meant to reply to the one above this one.
Any australian working in the US that is able to obtain PR or citizenship likely has a well paid job that provides health insurance. While I feel for the folks in the US without coverage, lack of access to affordable health care does not really apply to employed, skilled immigrants. In my experience US health care is the best on the planet, its also the most expensive.
From my perspective, US health care is way above the quality of healthcare in Australia. Price, not so much...
Australia has a very high standard health care system. Probably on a par with the UK and the U.S.
Given that insurance companies will soon be excluding "pre-existing conditions", there's a good chance you can't get insurance under a corporate plan anyway.
Edit: I replied to the wrong comment, meant to reply to the one above this one.