If you don't already have the PPK, do yourself a favor and look at a Keltec P32. Smaller, flatter, much lighter.
IMHO, the PPK is not a great platform a for "smaller" caliber handgun intended for CCW. You can find a smaller, lighter, more concealable weapon in 9mm, 40 S&W... heck even in a .45
That said, I do like the PPK. It's a proven classic. Still, there are better carry options out there.