Ditto on your response from post below, too, there really aren't many solo Iconic stories for Diana. Although, let me ask, to play DA in a way, what definition of Iconic are you using? What we feel would be iconic to the general populace or iconic to our own personal tastes?
And I'll have to do some thinking but expect an answer from me in the next day or so.
I would think iconic to our own personal tastes. When I talk to the general populace (non comic readers) I get mostly the same story: either the great origin story or some fun episode from the Lynda Carter WW series.