I think the first question you should ask yourself is "What is your intended purpose for that gun?". Is it for concealed carry, home defense, range toy, or hunting? Most guns can cover several uses, but a 9mm is not an ideal hunting cartridge. Also, what will the new gun do that your current gun doesn't? I don't see the point in duplication unless you already have a vast collection.
With all that said, I'd say go for the GP100 in .357 magnum and pick up ammo when you can find a good deal. Mine is a tack driver with .357 mag, but groupings for .38 special aren't as good. I'm not sure how multi-caliber guns would really work in practice.
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The ATF should be a convenience store instead of a government agency!
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