I’m perplexed why you claim the Glock 19 isn’t suitable for CCW. It’s probably one of the most popular handguns made for that purpose. A Glock 17, I’d agree with you, though you can dress around it, but a 19 should be small enough to pull off. Especially with a good holster—not that you weren’t going to use one with a Glock anyway—and belt. I suppose if you like the Glock grip feel, then the 26 might be up your alley. Add +0 or +1 extensions to the mags if you don’t like the three-finger grip thing.
I have a Glock 30. It’s a perfectly serviceable tool and I’ve yet to have a failure with it. Accurate enough. You’re not going to be bullseye shooting with it, but the pistol’s still more accurate than I am. If you can’t shoot a possible with it on the Texas CHL qualifier, it’s your fault, not the pistol’s. The lack of manual safety doesn’t bug me. It does bug other people. If you carry it in a good holster with good retention, and don’t touch the trigger until ready to shoot, you’re good to go. I’ve finally figured out what Glock fans are talking about when they rave about its trigger reset. I find it makes it a lot easier to shoot faster, more accurately. Size-wise, the 30’s between the 19 and 26. The wide slide is supposed to make it more difficult to conceal, but I haven’t found it to be an issue. I guess you could get one of the S models. Or hold out for the new Glock 42, which is supposed to be a single-stack .380 ACP, a la the S&W Bodyguard, Kahr P380, etc…
I’ve a friend with the Kahr, and it is truly dinky. Like, fit into your palm, small. Enjoy spending the 500 rounds to break it in and figuring out what it will and will not run on though. At the end of it, it’s still a .380. Better than nothing. It’s striker fired, like the Glocks, with a very long trigger pull. Surprisingly accurate, and not that unpleasant to fire, especially compared to a snub-nose .38/.357 revolver. If you’re bound and determined to make your CCW a tiny pistol, this site has a load of reviews and data on them.
Any of the 9mm/.40/.45 family with proper ammunition will work as well as any of the others. Which is to say, not as well as a rifle or shotgun with buckshot. Shoot the one you’re most comfortable with. What’s “Proper ammunition?” This FAQ from Ar15.com will help answer that. I use the Federal HST in mine. Groups well, recoil isn’t that much more onerous than WWB, quite a bit of muzzle flash though.
Do you plan on practicing a lot with it, going to the range frequently? That’d be helpful if you were thinking of something with a somewhat complicated manual of arms (1911, the various things the H&K USP lever does, etc…) Or even for choosing a semi-automatic at all. All semis will fail (knock on wood) and you need to know what to do when it happens. That comes with practice.
What we did for my GF was go to a range that had an ‘as many pistols as you want to shoot’ rental fee, and tried out a bunch of pistols. So much of choosing a pistol has to do with feel, and you can’t get feel from a computer screen.