No gifted kids here - but we love to build! I have more legos than I care to admit - most from yard sales and freecycle. My sons like the kits, but spend most of the time building their own creations.
We also love unit blocks - and still use them to build castles, army forts, buildings, farms, etc.
Another favorite are the Keva Planks - can be a bit of a challenge - but that is part of the fun.
Legos get the most use - but i love the wooden blocks and the keva...