I always thought it was stupid to put that NRA sticker on your vehicle...it's like a sign to would be thieves saying "Gun or guns to steal here" (be it their car or their house) One guy even told me once that his NRA sticker really said- "Don't **** with me, I've got a gun" ....sure, if you are there. It might also say, "you'll have to shoot me first, then rob me.."
As for reliability it is hard to beat a good revolver. I owned 2 357's, a six inch barreled Ruger Security Six that had some trigger work done on it, and a four inch GP100. But do to the wide profile of the cylinder and my small size, neither was very "concealable". But if I was going for open carry, I'd be happy to have either on my hip. As far as "stopping power" goes, the .357 has a good track record. You can fire .38 Special rounds in it for practice, and it's an easy round to reload if you get into that.
I might slip my LCP into the glove box now and then, but where I live car break ins are pretty much nonexistent. If I go in towards the city, the gun stays in my right jacket pocket even when I'm driving. In summer my right pants pocket...which was the reason I picked the tiny gun for in the first place, I realized carrying a larger gun had me leaving it in the car or at home many times as it was just too heavy or uncomfortable on all occasions. So my rational there was - a smaller gun I carried all the time was a lot better than a bigger one I only carried some of the time.
I do think I might look at a different carry gun while shopping with my son...a "cut down" 1911 in .45 is still going to be what I look at first