Never owned a Glock 23. Had a Glock 22RTF and they are a really great firearm. I did have a friend that spanked me pretty well with his Glock 23 though!
Now, I much more prefer a Glock 21SF, 45ACP. Very nice, and lots of firepower!
you should be able to find one for 500 or less new from good shops. However there are some good deals on good used ones here. If you plan to carry i would go with the 23. I had a 22 but traded it for the 23 because it fit my hands better and is easier to carry.
I have a 22 and 27. Got the 27 for a carry gun. Found out that if I can get away with it, I carry the 22 more than the 27. I find that carrying a full size with a Raven holster is not much different from carrying the 27.
I have a 22 with the grip chopped down to a 23 size grip. I also have a 35 and love that too. Both my dad and my mom have their own 23s and those are good to shoot too. You really aren't going to go wrong with either. Hold one of each and see which one feels better to you.
I bought a 17 over the 19 recently for the full size that was just a little bigger. I shot my buddies gen 4 23 and really like it, but I wld get the 22 if you really want the .40. Def a personal prefference and the smaller one is lighter and a little smaller if you are going to CC it all day everyday. Either one is sweet - good luck.
19 would be my first choice but if you are set on a 40 I would go with the 23.
Ol Bob at PSS may have just what you are looking for used and he sells new Gen 3 22/23 for $489
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I prefer the glock 27. I had a 19 (same size as 23 just 9mm) and felt it was too big for CC in the summer. However, I am VERY skinny. For most people the 19/23 are the best guns glock makes. If you go the full size route id rather get the 21.
I own a 22, a 23, and a 27. The G22 goes to the range sometimes but sits locked up most of the time. The G23 sits loaded in my nightstand, and my G27 is my every day carry. I wear it IWB year round and trust my life to it.
Any Glock chambered in .40 is a good self defense gun!