Belle, if you don't already have a big stash of technic LEGOs, I highly suggest LEGO Education's Education Resource Kit. It was a better buy when the prices were cheaper but it's still a great add-on for the NXT2.0. Plus, if you purchase any of the NXT books and I warn you, most NXT books are written for NXT1.0, then the add-on kit will allow you to build those as well. Now if you already know all this lol - feel free to ignore. 8-)

We have 2 NXT1.0 kits, one for each boy, and I'd love to have a kit of my own.