Probably my Sander Cohen statue. It was gifted by Ken Levine to people that worked on the original Bioshock game, and to a handful of press people and fans. I can't remember how many they made, but it's just a little over 100 if memory serves.
I came close to owning a Sonic the Hedgehog statue that is 1 of 1 and was at Sega of America in the president's office back in Sonic's heyday. That would've been the ultimate piece.