peach.. i always ask for EMS express (Global express in the US) to ship things over the Australia
1st Class mail takes 1-2 weeks.
If Global express is too expensive, then get global priority instead.
I've had items sent via global priority and global express at the same time, and the priority arrived a day earlier than express.
With that said, it also depends on the item you're buying. If it's a high end item, do express