I'm going to be putting together an Essentials-only campaign, with initial characters limited to the four base classes and five base races, and with the option to choose a new character from the second book after a few levels. I am even going so far as to set it in Nentir Valley. I want a classic feel for the campaign, with tight archetypes, in order to play off what I now recognize as one of D&D's strengths (the rigidity of old classes and races). I am also going to develop a "named level" stronghold system for when my PCs hit Paragon, in order to change the way Paragon is played, add more diversity to encounters, and again callback to that old-school feel.