About 95% of the time I carry a Kimber Ultra Raptor II 3" barrel .45ACP. I use a Mitch Rosen high ride holster on the strong side. Occasionally I will carry it in an inside the pants type holster under a tucked in shirt on the weak side in front. It is pretty easy to get quickly by unbuttoning one button, or you can sew a button in place and use velcro in its place for even faster access. I don't like this position for all day carry as it is not very comfortable but it is quite concealed even for a pistol that size. If I have to be very careful about the gun printing I will carry a Ruger LCP .380, or Ruger LCR 38 +P in an ankle holster. I carry everyday, all day and will simply leave my weapon in the truck if going into a prohibited building.
The new Kimber 9mm is pretty sweet, but in my opinion if you can conceal it, you can conceal the 3" barrel .45. More firepower is always better IMHO.