I think of those, the La Dona as it's very feminine. And unusual enough so that it'll get a second look at nighttime.
BUT my all time fave Cartier is the Tank Americaine. The Tank Francaise is a bit too boxy looking for me but the Americaine is sooooo elegant, and makes everyones wrist look tiny! Have you considered it? Take a look in the Celebrity Watches thread - Jennifer Garner wears one every day.