I lived in the US for over 10 years and none of the banks are really any good……Bof A, Suntrust, Wells Fargo. I got sick of their monthly fees among other things.  I changed to a credit union who have no fees, free counter cheques, bill pay etc.  I still do my banking from Au and pay bills for my properties there. I bank with CUA here and the credit unions there are better. 
Setting up an LLC is very easy.  Takes 10 minutes online, cost about $185.  No lawyer needed, but you need to have a US address for your office.  Australians need to be aware of their tax obligations to the US, when investing in the US.  Their system is very complex and not only might you have to file a return there, but also declaring your Au. income.