Rohrbaugh and MK9 are tops. Discontinued I believe is the S&W CS9 (Chiefs Special) that might be close to that size but a bit larger. The CZ rami is all metal but a double stack mag and larger. Kimber also just released the Solo that has an aluminum frame. Looks great and about as small as the Kahr. It is a bit pricey though and getting mixed reviews. If a polymer frame is not an option and must buy right now then the MK9 would seem the ticket in my opinion. I don't think I have ever read of a problem with the MK and K series Kahr's. I'd like to see Seecamp or NAA come out with an all stainless 9mm. An upsized Guardian seems about ideal.

The Kimber solo is comparable, but I find the font and back strap too slick. Also, the gun JUST came out - so its harder to find. And, I'd personally wait a little time for the bugs to get shaken out of the design. I've read mixed reviews for reliability, so far.