Dungeon Masters Guide
I may be nerdy, but this is the set of reprints I've been waiting for! Best official edition of D&D ever published. I know I certainly played more hours of this game than every other single rpg combined. So many great campaigns in the Forgotten Realms, Ravenloft, Planescape, and Birthright. So many awesome memories are combined with this rule set. I love the fact that WotC has reprinted them!