What is your RAREST collector item?

[misterunboxers]

Need some help with this one I know which is rarest, that would be the Borderlands Tile which is OOAK. But, there are other rarities among the collection what would you guys say. The Ninja is less than 30 world wide, that number is straight from Klei, and The Maw concept art signed by the team was given out at PAX East 2013 one a day for a total of 3 plus I think Twisted Pixel kept one. Then there is Dark Souls Press Kit, incomplete. If given the chance to have one of the four which would you guys choose?