Until recently my small concealment gun was a Kahr K40 that I really liked, but I realized a few months ago I hadn't fired the thing in years. I was also never happy about the mag capacity. The carry mag was 5+1 and the spare was a six-rounder.
All of my "shooting" handguns are in .45 ACP so I began looking for one to replace the Kahr. Slim was not as much of a consideration as overall size so I ended up choosing a Para Warthog.
Despite all the negative comments about their reliability I have completed the 300-round break-in period without a failure of any kind. Almost a disappointment as I enjoy tinkering with my 1911s.
I'm much more comfortable with 11 rounds of .45 before a reload than I was with the six in the Kahr.
The only changes to the stock configuration were to replace the mainspring housing with a Smith & Alexander arched mainspring housing. It fills my hand a bit better and is a considerable aid in maintaining control under recoil.
And, a fiber optic front sight was requisite. I don't have them on all my shooters yet, but in time I will. They are a huge aid.
I do not like the striker-fired system or plastic guns. JMHO, but I'd go with a quality 1911 format of some kind. There are so many nice guns to choose from it shouldn't be hard to find one that is satisfactory.