Carry gun is now a Kahr P45. Love it. It's a handful to shoot but wicked accurate and super-slim.
Used to CCW a Glock 19 and Glock 26... and carry a 1911 at work (openly). Have no problem with 9mm but when the chance to move back to .45 came back up, I jumped.
Have no problems with .40 -- just don't really feel the need. I trust the 124gr 9mm JHP when I have to and carry 230gr Gold Dots out into the world.
I'd carry a .380 if I didn't have a choice on something compact and larger caliber... and I'd make sure my running shoes were laced tight.
my .02
SoTG