The Millennium Falcon Metallic Nano Puzzle looks like a delight. It's one of those puzzle/models that you punch out of thin, laser-cut pieces of sheet metal and assemble with tweezers and pliers, and the finished model is quite a beauty. It's $15.30 plus shipping from Japan. It looks more complex than the models I've done to date (most took less than an hour to complete), so be prepared to spend some time on it.
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.