Hi Michael
No need to set up 2 Ebay/Paypal accounts
I have 4 shipping addresses attached to the 1/one Ebay account
As Rhys as earlier mentioned, all you need to do is set your primary address as your USA address, then you should have no problem bidding on US only auctions (of course if your are bidding on local/Australian auctions, you will need to revert back to your AU primary address - easy to do
At the time of paying via Ebay/Paypal your nominated US address should be shown, you do have the option of selecting different address, however often the postage is already determined based on your primary USA address *if this is was has been selected
I'm certainly no Ebay guru, but if i can assist, just give me a call
Regards,
Andrew