G. Willikers is quite right. Owning and being skilled in the use of a firearm is not all there is to surviving a deadly-force encounter. But the prospect of surviving such an encounter WITHOUT a firearm and the skill to use it well is a grim one, indeed. I think loftier thinkers in the world refer to it as a "necessary but not sufficient" condition.
I think your decision to procure and become skilled with a firearm is prudent. Just don't stop your preparations after you've become skilled.
About the possible choices you listed:
1.) I've shot 3 different Beretta M92s, and 5 or 6 of the Taurus clones. All but one of the Taurus clones shot noticeably tighter and more reliably than the 3 Berettas.The one that didn't shoot better shot groups so close to the size of the Beretta groups that the difference wasn't worth mentioning.
2.) I have no experience with the Ruger 9E, but I have bought, carried, and used Ruger products for all of my adult life and a good part of my childhood. They are invariably rugged, easy to use, and (usually) reasonably priced firearms, on which I would readily depend for my life. I would expect the the 9E to be no different.
3.) I am currently shooting a C-100 Canik as a sort of "endurance test", and have been delighted with it. Its DA/SA design allows the owner to carry it in condition 1 ("cocked and locked") if desired, or with the hammer down on a loaded chamber ("condition 2", I believe?). It has shot every type of factory ammo I've fed it, and a number of handloads that other more expensive 9mm pistols had trouble digesting. If the C-100 can still be purchased for between $300 and $350 where you are, I consider them the best "new in the box" buy among the centerfire auto pistols. I obtained mine from a local "Academy" sporting goods store. The C-100 does not come with a decocker. It has a thumb safety, which prevents the piece from being fired until pushed down by the thumb of the shooting hand. Personally, I find decockers an inadequate attempt to obviate the need for thumb safeties, and have seen my share of negligent discharges as a result of depending on them too much.
4.) I'm not familiar enough with the other pistols you list to render a meaningful judgement about them. I would stake my life on the pistols on which I HAVE commented.
5.) Try to avoid pistols which become inoperative when the magazine is removed. This mechanism is sometimes called a "magazine safety" (ironically) or "magazine disconnect". The ability to cover an opponent with the remaining round in the chamber while reloading is one of the salient advantages of an automatic pistol over a revolver. This "safety" feature negates that advantage. I am convinced that this feature was dreamed up by Ralph Nader and a committee of closeted gun-haters who, after inflicting their invention on the gun market, all fled in different directions, never to meet again.
If you cannot make the hammer fall by squeezing the trigger with the magazine removed, I strongly suggest that you reconsider purchasing that pistol. The only exception which comes to mind is the excellent, though expensive Browning P-35 (sometimes called "Hi-Power"). Its magazine disconnect can, mercifully, be removed fairly easily, and it usually improves the trigger pull, in the process.
No need to apologize for "long posts" here. I seem to be the "poster child" for that particular malady, and I make no apology for it.
One last thing... Please DO try to work the purchase of a pump-action or automatic shotgun into your budget, somewhere. The "schlick-schlack" sound of a round being chambered in one of those is sometimes enough to discourage would-be intruders from pressing their agenda. If they are unwise enough to continue their plans to intrude, they face almost certain death at the muzzle of one of these.
