The G23 is by far and away my absolute favorite carry Glock. I (due to my dress requirements at work) do not get to carry my G23 NEARLY as much as I wish I could but I absolultely love mine. I am a big fan of .40 S&W to begin with the and G23 size is just perfect. If it wasnt the G23, it would be the G32 in .357sig (same frame) or the G19 in 9mm (also same frame).
Good luck!
EDIT TO ADD....holy crap, I didnt realize how old this thread was and I didnt bother reading all the comments before I posted mine.