Hello papadork and welcome to the asylum...
The Kahr brand is a good choice for a CC handgun. If you've not shot the 9mm and .40 Auto side by side in otherwise identical guns... I suggest you do so.
Like Theohazard and goodshot... I personally do not like the .40 Auto cartridge. Entirely subjective on my part, but I do not like the recoil impulse or shot to shot times of the .40 Auto when compared to other calibers. It's not a matter of recoil, as I own and shoot 10mm Auto regularly, it's simply that I don't find the trade-offs to be worth it as compared to a 9mm.
Shoulder Drive Nicholson Club