Just a personal comment, but one Kahr 9X19 has more utility value than a bucket full of S&W PPKs.
While this is true, it really shouldn't have much impact on the OP's decision, since this is a "grail gun" of his. The PPK is still a perfectly servicable carry gun.
It seems that S&W has, at this point, worked out most of their teething issues with their PPK. My suggestion is to go over to waltherforums.com. There is a great group of folks there that can answer any Walther question you'll ever have.