If you're teetering on the brink, try "Don't Think About Her When You're Trying to Drive" from Little Village. It'll take you all the way over the edge.
After a "better for both of us" breakup I still like "Love the One Your With" just to get the juices flowing.
And when it's "good riddance" time, give me "Like a Rolling Stone", loud, heavy on the "How does it feel?".