Based on looks, XC Pro then the XT. The Le Tech kind of looks odd, but could lead to some interesting conversations? The DuoPar looks pretty fugly in my opinion, that is pretty much worthless anyway. You could just get them all set up for the bike and play pick a RD every time you take her out?
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My bikes: 1970`s Roberts - 1981 Miyata 912 - 1980`s Ocshner (Chrome) - 1987 Schwinn Circuit - 1987 Schwinn Prologue - 1992 Schwinn Crosspoint - 1999 Schwinn Circuit - 2014 Cannondale Super Six EVO