The boy just got this LEGO set and I'm really, really impressed by the design. It has some terrific features (e.g., working scissor doors and a clear rear deck that lifts up to reveal the "engine") and some interesting bricks. Plus, since it's a 3-in-1 design, even if you don't take a particularly creative approach to your building, you can still enjoy a variety of results. All in all, one of the best LEGO sets I've experienced and certainly the best IMO below $25.
http://creator.lego.com/en-us/Products/31006.aspx
