I’m basing my comments on the fact that I’m assuming you have an eye on SD and CC for your choice?
Apparently others feel the same as I regarding the P250
, which means if your tastes change you may have problems selling it down the road.
As someone else stated, when you start talking ‘bout conversions I’ve usually found the price is so high I’d rather just buy another gun instead of the conversion. Also, since most of my guns are bought with an eye towards SD, the thought of (constantly) changing out parts in a SD gun just doesn’t really appeal to me.
My recommendations were based on trying to save you some money, but if money's not a problem, nuttin' wrong with a SIG P229R!
The pragmatist in me says go with the cheapest, quality gun that you think you like, since you're on a steep learning curve (being your first “real” gun). Chances are good that while folks in here can steer you to a fine sidearm, you're going to develop likes/dislikes down the road. It would be nice for yourself if you at least pick your first one with an eye toward selling it later as you learn what you like/dislike.
With that in mind, IMHO in no particular order:
1. SIG P229(R?) One o' my main CCW in winter, but pricey!
2. SIG SP2022-check grip size, and it is slightly bigger than the P229R. Starting to get a bit big for CC in warmer weather. A good buy for $495 with night sights and 3 magazines!
3. XD "old" line-probably wouldn't have any trouble re-selling as they're extremely popular, and despite what some will tell you, the grip safety is a viable feature (remember Plaxico?). There seem to be a lot of discharges with Glocks-I don’t know if folks are doing so with their finger or something is hanging the trigger while re-holstering. With a grip safety, conventional wisdom says in addition to keeping your finger out of the trigger, you place your thumb on the back of the slide as you re-holster, which will remove the web of your hand from the grip safety and also prevent the slide from moving rearward should the gun hang on something while re-holstering.
You're going to have to decide which trigger style you prefer, and what type of safeties you'd like (if any). My SIG's are the DA/SA type since that's what I grew up on and am used to (as well as the heavier trigger pull of DA revolvers).
Remember, there appears to be a “problem” with folks going off the deep end AFA wanting a (hair) trigger good for shooting targets. In a SD weapon, you want a trigger pull heavier than on a range queen. If you can’t shoot just because of a heavy trigger pull, you need to learn!
Also, might not hurt to get a copy of Massad Ayoob's Book of Concealed Carry!