Wow, tough to cut it down to three. Though for carry I always had my circa 1994-5 1st gen G19 at my side or in the glove box while travelling back when I lived in Texas.
The rest are like children. I couldn't choose. I carried this model 19 when I did recovery work for a friends towing company:
And everyone has to have a gun for discreet work:
Yes, I am fond of S&W:
And it's amazing how fast you can reload a 10mm model 28 with moon clips:
Bought a 3 inch Sp101 for $300 on impulse off a randomer at at a gun show. Hope it's legal.
I am also a 1911 guy at heart. STI and Ace Custom 45's are located in Texas. In fact, I once lived less than a block from STI, and a 20 mins drive from Larue and Brazos Gun Works:
And owned one of the rare desert tan Glocks they released in like 2005 or so. They are common now, I bet:
And of course there was the 45 tactial. I think it had a Knights suppressor way back when? I forget.