If you're talking 100% reliable, I agree with those who say the J-frame. Otherwise, semiautos are a whole other story. Early last week, I picked up a Kahr PM9 and while it's not Glock quality to me (the overall quality has yet to be determined as I just got it), it has been a great shooter that's accurate, low recoil, slim, and fits in my front pocket relatively easy.
While it has some Glock-esque features, it does point better for me than a G26 and is considerably thinner. I'm pretty pleased with it so far, and think that while it's not as reputable as the Glock line, it certainly is in contention.