Get the 1911 in .45, you'll never regret it. When I bought my first pistol in 9mm, I soon wished that I had bought a .45 instead. I had to wait several years to save up enough to get the .45 I really wanted.

.357 sig- skip it, its expensive and difficult to reload.

.40 S&W- only makes sense if you want to get more punch out of a smaller frame pistol: a pistol sized for a 9mm rather than one big enough to shoot a .45.

9mm- cheapest to shoot.