Hold each of the guns in your list in your own two hands and pull the trigger a few times (after checking that it's unloaded, of course). That will narrow down the list a lot. None of us knows which gun will fit your hand the best.
This first-gun decision is not that important. Just buy one of the better-known guns with a history and you'll be fine. If you decide you don't like it, just sell it. Guns retain their value fairly well, especially if you buy used in the first place. Since you can sell the gun at any time, just think of yourself as renting this first gun for a while.
Some people on here spend a lot of time arguing about the different features of the guns, worrying about their next purchase, dreaming of building a big gun collection. Others just try to find the one or two guns that fit them, then they mainly worry about becoming good shooters. Become friends with the big collectors and thank them profusely for letting you try out all their guns
But you should try to become a good shooter.
If you haven't considered a CZ-75B already, you might add that to your list. Not too expensive, even new. You can find used, police trade-in SIG P226 at
www.kyimports.com for under $400, and SIGS hold up very well. Get a full-size gun in a moderate caliber like 9mm. Don't get a sub-compact gun in a bigger caliber, such as a .40. That might give you a bad flinch that will take years to get rid of. Don't worry about a good manstopping caliber yet, worry first about becoming a good shot.
Go to
www.brianenos.com and buy his book, "Practical Shooting: The Fundamentals." Also check out the forums on shooting technique there, a lot of top competitive shooters post there. The shooting technique FAQs at
www.glockfaq.com are great too.
Have fun, let us know what you end up getting.