I'm looking for the same type of gun. I have not shot any of the three you mentioned, but this is what I've heard and read :
Kahr PM9 and CM9(being the smaller) are both excellent and reliable shooters.
Sig P290 is having some issues that need to be worked out ... light primer strikes caused by the hammer. Google it and you will find some answers.
Beretta Nano I know nothing about yet.
That is all I currently know but I hope it helps in some way ...
Matt
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