Kara,
Nice to see you are still giving this purchase great thought and care. You are using your head. Most any of the guns mentioned will do the job if you do yours. Just practice, practice....and yep, you guessed it....practice some more.
Also, let me make some ammo suggestions. Once you get your pistol, whatever it might be, make sure you keep it loaded with a good quality defense hollowpoint round. Hardnose FMJ bullets are ok for practice, but you want a bullet that expands when it comes to protecting yourself. In 9mm, the Speer Gold Dot 124 gr +P is hard to beat. In .40 S&W, the various Gold Dot loads again look good....I choose the 180 gr variety myself, but the lighter ones kick less. And in .45 ACP, I again like the 230 gr Gold Dot as well as 230 Gr Remington Golden Saber. And should you go with a .357 Magnum, the Federal Classic 125 gr JHP is one of the top rounds. And finally for the .38 Special, the tried and true 158 gr lead semi-wad cutter hollowpoints +P loads continue to perform well....especially from short barrel revolvers. All of the above loads do pretty well in gel and have a proven stopping record on the streets as well.
So once again, practice with what you get, shoot good ammunition and keep the weapon maintained. Do all 3 of those things and you will be as well equipped and prepared as any of us. Again good luck in your search for a weapon. Let us know what you choose. And when you need accessories such as holsters and ammo, come back and we'll tell you where to find it cheap!
---Charging Handle
[Why is it that all of Kara's posts go to 3 pages?] LOL!