Batman: JLA: New World Order by Morrison and Porter. The Hyperclan is taken out pretty much single handly by the mere mortal Batman that they underestimated.
Captain America: Ed Brubakers entire run, sorry if this breaks the rules but it has been bad ass from beginning to present.
Avengers (Any incarnation): Ultimates vol 1 and 2 by Millar and Hitch, some of my all time favorite reading right there!
Teen Titans (Any incarnation): The Judas Contract, one the best stories in all of comics period.
Hulk: Peter David and Dale Keown, when the Hulks three dominate personalities all merge into one. Not sure if the arc had a name or not but this has always been my favorite period of the Hulk.
Superman: Action Comics #775, shows that when he wants to Superman can be the baddest man on the planet! Brutally taking out the Elite, I loved this issue.
Spiderman: OMD, fuckin now way!! I keed I keed!! Kravens Last Hunt, it's a masterpiece in the history of Spidey.
Wonder Woman: JLA A League of One.