For me, Kahr MK9 with Kahr wood grips... in a variety of carry systems depending on what I am wearing (SmartCarry, CrossBreed Mini, Galco Classic Lite shoulder rig)
I love my G27. I've carried it more than any other pistol for a while now. My other main carry is my G30SF but the little 27 has plenty of horse power and is small enough to ankle carry when "concealed means concealed."
Mostly I carry in the Serpa and have one 13 or 15 round spare mag.