Mrs and I have moved twice from Canada to Taiwan and just recently to China.
Must echo jiejie''s feelings. Don't bring stuff unless you really need it. If you include the cost of shipping and transport, it is easier to purchase it new here. Many of the gadgets don't work anyway because of the difference in electrical power.
Every time we go back to visit family, we bring back the maximum weight for luggage filled with stuff we have decided we still want but can't find. Mostly to do with food or cooking utensils.
As for shipping within China, this can be a horror show. The moving company may quote you one price but after they have your stuff, they suddenly add "taxes, surcharges and fees" which if you do not pay, you don't see your stuff. (This happened to my workmate)