This is a fascinating thread since it shows how each of us has personally assimilated Crowley's unique vision. I think I would choose the Tower, especially if the person I was talking to was already familiar with the RWS version. The "jaws of Dis belching flame" and the Eye of Horus/Shiva are a distinct departure from the more typical "lightning-struck" motif, while still reaching the same conclusion. But the Aeon would also be a good choice since Crowley's stated purpose was to "depart completely from the tradition of the cards, in order to carry on that tradition" (and it is a consummately beautiful card). Art would be a good option for me as well since I spent a good deal of time puzzling over and coming to grips with its practical implications. Not sure about Lust; the uninitiated might fixate on the overt sexuality and miss the "joy of strength exercised" emphasis, which is much more dynamic than the "offsetting forces" paradigm evident in the tradition (although Case had an interesting perception that the Woman is opening the jaws of the Lion and allowing it to "speak," not holding them closed).