I would guess that it depends on your purpose. You built a pretty good case for the CS in your post, but all three are beautiful guns and serve a different purpose.
I get it, but I just can't do it. I have carried a Ruger LCP for a couple of years in the summer, but there are too many quality small 9mm's out there.
I assume that there is no way H&K would make a new version of the P7M8? My understanding is that the manufacturing process is more complicated than most current manufactured pistols.