But that's because I disfavor two tone watches. As others have said, sell whichever you like the least. Of the three pictured, I'd definitely keep the GMT. And also as others have said, if you sell two of the three and could increase your Lange budget to get something more special, do consider that as you'll have plenty (IMO) of Rolex left.
Cheers, and let us know which Lange you get.
John