I've got a G19, which is a great gun. I've had it for years, since long before the 22/23's, let alone the 26/27's.
But for CCW, I just got a Kahr MK40. The 26/27 twins are just too thick, and the Kahr seemed the best answer to the question What to get that's very concealable (even in summer) and still packs a serious punch?
If you're just wanting a Glock, get a 17, 20, 21 or 22 (something full-sized). If you're wanting something very small and concealable, consider the Kahr MK's.