Girard Perregaux

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Congrats. I can recomend a very dark Grey crocodile or even a very dark blue would add a bit of life. GP is an underrated brand, they have a few gems but shot themselves in the foot a few times. I do have a question, is that white gold plated or what is k... 

Light brown or tan croc would look awesome

But what you want. Experiment, with other straps. Geross.

. . . dark shiny tan croc plus I would add one gold heavy stitch close to one side of each lug end of the strap, al la Leica watch strap (but not in red). That will make your fabulous watch almost unique. Gold to reflect the moon-phase window etc. I have ... 

maybe experiment with the stitching