Aaah, my friend, a Duometre is a piece to get!
The Chronographe is top top tip top.
Now, I would try to hunt one in white gold. The combo white case / black dial is uber cool.
As for the QL, I would go for the white gold one, enamel dial. The black dial is top cool, but the moonphase disc is much nicer, in my opinion, on the enamel dial.
Best,
Nicolas