So there will always be a finite number of official monsters in the Monster Manual. Now there's of course only one book for 4e. That got me thinking what is the power-gamer's choice for the breath type? Some monsters have resistances or immunities. Acid, Cold, Fire, Lightning, or Poison.

I'm thinking of wasting a lot of time going through the book and tallying them up, but at this point I'm guessing Acid is the best one to go with, but we'll see. :)