Personally if I was going to have just one very nice Luger and shoot it a little, I'd go with .30 Luger like the Swiss from Legacy. The .30 Luger round has significantly less recoil/energy than 9mm and just feels less likely to break a numbered part. And in my entirely subjective opinion the 1906 Parabellum with a 4.75" barrel is one of the most elegant devices ever created.
You really can't go wrong with any of the pistols you linked, they are all fine examples.
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