For Aus have a look at some property prices to give you an idea.
Take a look for example at Perth WA.
And then the exchange rate and there lending rate if you will need a mortgage?
You will not see any off that 4X or fosters for that matter there.
And if you do like a pint i am sure its around 5 GBP a pint these days in Perth City area.
Then there is the matter of TAX
Australia Income Tax Rates 2010 – 2011
Australia Income Tax Rates for 2010 – 2011
Tax Rates for Residents
AUD$ 1 – 6,000 Nil
AUD$ 6,001 – 37,000 15c for each AUD$ 1 over 6,000
AUD$ 37,001 – 80,000 AUD$ 4,650 plus 30c for each AUD$ 1 over AUD$ 37,000
AUD$ 80,001 – 180,000 AUD$ 17,550 plus 37c for each AUD$ 1 over AUD$ 80,000
AUD$ 180,001 and over AUD$ 54,550 plus 45c for each AUD$ 1 over AUD$ 180,000