A floating, subjective standard.
What is mode of dress, prevailing climate, build, and prefered mode of carry? How much weight are you willing to carry?
For me a CZ-75B. CZ-75 PCR, Browning Hi-Power, and Kahr K9 are fine. A lot of heavy steel in Georgia. I'd rather have a good grip, negligable recoil, long sight radius, and steel in my hand when I'm trying to save my butt. CHL - learn it, live it, love it (yes I do have other hobbies). My other carry gun is a Kimber Pro frame, .45 ACP.
I've never tried a H&K P7, so I cannot really comment. From handling it and everything I read (heard), I suspect I'd love it.
(Most) All the choises mentioned are good guns. Gun-wise you cannot go wrong. The only wrong choise from that group is something you cannot conceal, and only because of the intended purpose.