A G23 would be great for concealment purpose. I'm not that familiar with that caliber, probably shot less than 50 rounds in my whole life. The Glock in .40 S&W is very popular here in Georgia, among civilians and law enforcement. The GBI are getting ready to dump the S&W autos for the Glocks.
I only shoot the .45 and 9mm, just trying to limit the number of different caliber to keep around.