How to decide what to take to Australia, 5 weeks more to go

I have been busy for weeks sorting out which cloths, shoes, toys to take with us, it’ like seems a never ending story, and slow progress. And of course if you ask the kids, they want to take it all. I felt that what is working best is to let the kids do a first shifting, after that there are 3 options for each item: Option 1: sea container, items will be available within 5 months, from now; Option 2: we make somebody else happy and leave it in Belgium and the last option with most space limitations: we take it in our luggage.