5270P would be my vote, if I had the cash to vote. I have owned 2 Datographs, the original and the Up/Down, and they are spectacular watches. If you can only add 1 you gotta go with the Grand Complication from Patek.
Late on down the road, you may be able to pick up a Datograph, the prices tend to bounce a bit.
Either way, good luck with your hunt!
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