Hi and welcome to the forum.
I will comment on the pistols on your list that I am familiar with.
For your first hand gun. If you are looking to keep your prices down and still have a quality purchase I recommend the Glock 17. They are supposed to have the new Gen 4 models out in the next month or so and they are supposed to be an improvement on the Gen 3s which in my opinion are fine pistols.
Next is the Walther P99. Particularly the P99AS. Is a fine gun but about 250 dollars more than the Glock.
Remember that these guns are striker fired and have no manual safeties on them. The Glocks has a trigger safety. These guns as all pistols must by law, all have internal safeties. But the best and most important safety is the one between your ears. Keep the trigger finger off the trigger at all times until you are ready to fire. Remember that and its all good.