The second firearm of choice that I will keep on my list of the three guns you need to own is the polymer pistol such as the Glock or a Springfield XD.
One of the reasons I’ve chosen a polymer pistol and specifically a Glock, is that a Glock goes bang every time. Numerous tests have been conducted since the pistols creation in 1981. The pistol has proven its durability by being dropped from airplanes, sunk in mud and even been left under water for over a year, and guess what? It still went bang! However, I don’t recommend doing any of the above test, just watch it on Youtube. There is a reason that a lot of police and military organizations throughout the world have chosen the Glock polymer pistol as their sidearm of choice. I really like the Glock 19 and Glock 17 and now 43 because they are chambered in 9 mm Parabellum, this is an NATO recognized round and is available at most any ammunition dealer. Another thing I like about the Glock pistol is that a Glock is a Glock is a Glock. Meaning that little has changed since the 80s when they were first produced. The current generation, generation 4 has changed very little, yes they have added some creature comforts like enhanced ergonomics of the grip and blackstrap and also a coil over recoil spring. But, little has been done to affect the actual pistol itself because the first time it was built it was built right. A Glock pistol can be purchased new for roughly $500. I recommend that you visit a nearby range that rents firearms and try a Glock before you buy one. There are no frills with the Glock pistol, it is a pistol designed to function and last under extreme conditions.