Another vote for Lego Mindstorms. A new set just came out so you might be able to pick up the previous one at a discount. Another vote for First Lego League,

Another vote for Lego Mindstorms. A new set just came out so you might be able to pick up the previous one at a discount. Another vote for First Lego League, they have a few age tiers, if you can't find a team to get on consider making your own team, we had a blast.