You are in Cal. An area considered to have AHB(Africanized Honeybees) the neighbors tend to not like those.
The aussie bees were sent over to deal with the shortage of bees for almond pollination.
They have never dealt with Varroa or SHB(small hive beetles). So you have a bee that really isn't up to snuff for living in the US.
The aussie bees are great in Australia.
I am going to recommend since you are starting. Please read.http://www.bushfarms.com/beesnewbees.htm