I would have to say that it is a tie between Apple Jacks, Reese's Puffs and Frosted Mini Wheats *...went off to the kitchen for cereal*
Cocoa Puffs rule all! Serioulsy, I'm 34 years old, and that stuff is as good as it was when I was 8. But as a responsible adult, it's pretty rare that I'll buy a box. I do eat a lot of cereal these days, but it's mostly Cheerios or anything from Kashi.
COOKIE CRISPS! They will own any of your cereals. Inless the love of my life (snickers) starts to make cereal.
I am like all of the Post Brand Organic cereals. If i am going to eat cereal, I like to have some fiber and whole wheat with lower sugar. These provide that with no added garbage.
Right now I'm at that that precise moment between breakfast and dinner, where I have the hunger of a dinner man and the taste of a breakfast man.