Nice choice on the Glock 23, Crappybob. I have a Glock 32 which is nearly identical to your Glock 23 except chambered in .357 Sig. I love it. Actually, I have a factory Glock 23 barrel for my Glock 32 that allows me to fire .40 S&W whenever I want too.
The only mods I'd recommend if your new Glock 23 isn't already coming with them is either Trijicon or Meprolight 3-dot night sights. They are a very worthwhile upgrade.
Any factory .40 S&W ammo will work great in your G23, that's what's so nice about Glocks. They are stone cold reliable.
DO NOT, I REPEAT, DO NOT fire lead bullets or reloads through your Glock. Firing reloads will void your warranty and lead bullets will foul your barrel due to the polygonal rifling. Glock and H&K USPs have this type of rifling in their barrels for the explicit reason of squeezing maximum velocity out of ammo for a given barrel length. Lead fouling will create a dangerous situation for a Glock, don't do it.
Lastly, for fun, buy a .357 Sig barrel someday and try it out. The .357 is awesome in the medium Glocks. Full .357 Magnum power out of a small autopistol rocks!
Again, good luck and excellent choice!