Shipping v/s storage
I have been through what you're going through -- been here in The Sandbox for a year and a half. I have to agree with the notion put forward earlier that you and your wife should seriously consider how much of your stuff (in the US) is really important for you here. Pare that list down until it's so small you can bring it all with you -- and maybe a few boxes you can ship via air cargo.
Put the rest of your things in storage in the US (those mini-storage places are everywhere and pretty darned cheap.) There are several good reasons for this: First, with all respect, you are much likely to be here shorter than you think, rather than longer than you think. Second, the huge increase in expats leaving in the past few (and future) months means there are great deals every day in the classifieds on everything from furniture to cars to appliances to toys (big and little).
I promise you -- especially when it comes time to move again -- you will find that "less is more."
Grizz