I'm more of a LEM fan than a proper DA/SA guy, but I'll submit my vote for the HK P2000SK. It's a remarkable little pistol - sized between a G26 and a G19. It conceals extremely well appendix in a GMCK, and gives up little in performance to it's big brother the P2000.
I was luke warm about the SK for a long time, and some of my older posts reflect that attitude. But I've carried it almost exclusively for a year and have developed a real appreciation for it's performance and concealability.