I'm also a big fan of `ci[(|'|"]` to change all the text between a pair of delimiters. I can type `ci"` while my cursor's at the start of the line, and it'll jump to the first set of double quotes, remove the text that's currently between them, and enter edit mode.
You can also use `cib` to change text between braces and `ciB` to change text between curly braces.