Is your target audience Australian based? If so, should you perhaps consider a host with an Australian based hosting server?
The site will be much closer to your customers (geographically) by hosting in Australia and by that logic, should receive a better experience (i.e. website load times). Having said that, not all Aussie hosts are equal either.
Where you host makes no difference to user experience or load times. Nor will it give you any type of performance advantage within search.