I favor the Glock 19 for concealed carry. If you want .40 then the 23 is a good choice. I have owned/carried Glock, SIG 226, Beretta 92FS and HK USP in .40 and Colt Combat Commander (Small 1911) and SW 681 .357 wheel gun. Don't like Beretta, big and heavy double action first shot and single action second, plus accidentally having the safety pop on while drawing it on the LE range. Never had to draw in bad situation, but that was always at the back of my mind. SIG had the same double trigger feel. The Glock, HK and revolver were always double action. Same feel with every shot. 1911 has single action every time. Like someone said whatever is your preference. One thing to keep in mind is ammo. How plentiful the supply? 9mm is used buy many military's and law Enforcement depts. world wide. .40 is, but not as much and .45 is fading. The U.S. Army has the Beretta 92 and that is 9mm. .40 and .45 seem to be more effective in stopping on first shot than 9mm, but I always double tap anyhow. Another thing would be to train, train, train with whatever you choose. Get used to the recoil and time it takes to get back on target, plus reload drills. Practice shooting with your week hand too. I'm a righty, but I can shoot quite accurately with my left. Most ranges won't let you do this, but if you have some private space, then practice quick drawing from side holster or concealed holster where you carry it. Gives you an idea and get your muscles used to doing it. Remember train, train, train. Train like you would fight too.