Step 1: Show your kids the original SW trilogy. Step 2: If half-a-year later they still talk about it, buy the key characters. Step 3: If they still play with them half-a-year later and keep asking for more, take a good look at Creator sets you already have at home.
Key requirements: sturdiness and room for minfigs.
About this creation
This X-Wing was made from 6914. I will make a dedicated entry with building instructions for this baby when I find the time.
This TIE fighter was made from 31004. Instructions will be coming as well.
You sure would not think of calling this Millenium Falcon, but it's the best I could do from 6743. Not worthy spending my time doing instructions for it.
This snow walker was made by my 6 years old son from 31005.