I have no idea what set numbers our family’s lego collection contains. But as I start investing in a Lego collection for my own children (it’s not too early, right?) I’ll be keeping tabs on Rebrickable – which calculates what sets you can form using the sets you own. It’s like getting a whole new spaceship. You can also get schematics for user generated constructions.
You can make stuff like this Lego Gundam (a Japanese transformer type robot). You’ll need 501 pieces, spread across 155 varieties of part. But it looks doable.