I would buy the CW9 and if I remember correctly Kahr has the nite sites for the CW series that stake on just like the standard sites.
I would go with the CW9. I have a CW40 and it is plenty accurate and I have not had a single problem in the 200 rounds I've put down range. Kahr does offer night sights for the CW series. Check out Kahrtalk.com for some feedback and ideas.
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