Check the stainless steel SIG P-232 with factory night sights and Hogue grips. It's everything the PPK/S should be and feeds modern hollow points with no problems whatsoever. The edges have been smoothed so it carries comfortably and the dimensions are almost identical to the Walther. I don't know anything about Bersa pistols, but PPK's are notoriously finicky about what ammo you put in them. I have a PPK/S also. The difference in quality between it (Smith & Wesson manufactured) and the Sig are obvious and dramatic. If you can find an older Interarms PPK, then you would probably have a pretty good little pistol.