If you decide to use the clip draw (I have them), make sure you also acquire the Saf-T-Blok as well. Better to be safe than sorry as it prevents the trigger from being pulled accidentally while putting the gun on. It pushes in and out with enough tension as to stay put but does what it is supposed to.
Check it out on the clipdraw site.
I carry my g23 in the holster made by glock. I go everywhere and do everything with it (run, work and etc.) and it holds up fine. For under $20 I've put this holster through it's paces. I've also worn it in my back (not suggested) and 3 o'clock, retention is good. Worth the money in my opinion.
I carry a G23 all day every day with a Versa Carry at my 6 o:clock. Took a day or so to get used to, and had to adjust my car seats but now that I'm used to it, I feel naked without it. I only wear a T-shirt in the summer and it conceals fine.