The PPS is still pretty easily best of breed, in my opinion. It is a bit bigger than some of the others (in length/height, not width), so that might be an issue if you're looking for a 9mm for pocket carry. I don't wear clothes with pockets big enough for any 9mm I would rely on as a CCW, so it doesn't matter to me. Anyway, the gun is unsurpassed in refinement and build quality in this segment, perfectly reliable, and super-accurate. I have nothing but praise for mine.
On the other hand, I'll take a minority position and recommend against Kahr pistols. Kahrs are great in theory, but they're often lacking in execution. Perhaps the 9mm pistols are better than my P380 (four trips to the factory, two frame replacements, and every part but the slide replaced at least once), but Kahr's quality control across its polymer lineup leaves a lot to be desired.
After the PPS, the Beretta Nano would be my second choice. It and the PPS are the most refined of the mass-production pistols in this segment. This with the Nano costing several hundred dollars less than the PM9, which really blows my mind.
Avoid anything made by Taurus. Quality control is terrible, and chances are too high that you'll end up having to deal with their shoddy CS.