A Glock 23 is a great gun. Are you skinny? You didn't give weight but chances are you'll have no problem concealing a G23 with the right holster and belt. Reliable, good capacity, good caliber, zillions of upgrades available.
The one complaint I have about my G23 is the .40 S&W is a snappy caliber. It seems to have more muzzle flip than my .45 and definitely more than my 9mm subcompact. Once I get some more trigger time with the 23 I'm sure I'll get used to it but I can get follow up shots quicker and more accurately with the 9mm.
Glocks have the typical european grip angle, which is steeper than a 1911 style. If you like the 1911 angle check out a Springfield XD.
Best thing to do is find a range that rents guns and try them all out. What works for some people doesn't work for others and a lot of it comes down to personal preference. Get what you shoot best and can conceal.