You've been given a lot of good advice so far and should read it twice and consider it carefully--it's that good. I agree completely with what was posted above.

A few other things to consider are your past experience and proficiency level(s). You said you prefer a semi-auto. That sounds like you have some experience. Are you used to a certain type of semi-auto. Some have safeties and some don't. Some have magazine safeties (S&W comes to mind) and others don't. Some fire the first round double action and all successive rounds single action. Others fire double action only and some fire with a hybrid type action (Glock's safe action comes to mind).

The reason for bringing this up is for you to consider what (if any) muscle memory you have built up in your experience. This doesn't mean you can't train a new muscle memory but doing so might require a lot of training to make that new muscle memory instinctive. This won't make a big difference on the shooting range other than a little fumbling and embarrassment when people ask if you know your own pistol. It can make a HUGE difference, however, if you have to use that same pistol in a stressful self defense situation where your instinctive muscle memory isn't the same as the type of semi-auto you're carrying.

I you're willing and have the time and money to develop a new muscle memory, it's not a big deal. If you're not, you should strongly consider using a type of semi-auto pistol you're already familiar with.

NoMercy brought up another thing to consider. Different types of occasions sometimes call for a different type of concealed carry. As an example, when I need to carry a pistol in my slacks pocket, I carry a Walther PPKs in 380. If I'm carrying in a fanny pack or a belt holster concealed by a shirt hanging out or a jacket, I carry a Glock 45. If you're concerned about trying to get some kind of major handgun caliber, have good concealability and something you're comfortable shooting, you might consider a single stack 9mm. Today's 9mm ammo is much better than the older stuff and a single stack pistol is fairly easy to conceal.

Hopefully this helps some. Let us know what you decide and how it works out for you.