All are great guns, and thus a hard choice. Basically it comes down to what I already have and what I need. The first one is hands down (if nickel), the next three are practically tied, the last one is a good gun but it is solidly last in this group of choices (though on my "wish list").
My choices in order and why:
1)Beretta 86, but only if it is nickel. In nickel and keeping the wood grips it has to be the prettiest gun made. Look great and feel good in the hand (I'm still kicking myself for not buying one of the two I saw about 2 years ago, but my cash was limited and I didn't want to pay $500+ for a .380 when I could get a nice 9mm for that, plus I figured they'd always be available- darned MD built-in lock law). In blue it would move to 4 or 5, still a nice .380 (possibly the nicest made) but when I eventually get one (sometime after I leave MD unless I'm lucky enough to find one used and in good shape) it will be in nickel.
2) (number 1 if above isn't nickel), the Uberti. I don't yet have a SA revolver and I want one. I wouldn't mind .357mag, .44spl or even .44mag but getting one in the classic .45lc would be a bonus. Nickel would be OK but for my first SA revolver I would prefer case hardening or bluing so it might move down to 3 with the Taurus moving up, I'd have to see it to be sure. Sight unseen (if that is the only option) I'd take the chance and get the nickel.
3) Taurus 92. I want one anyway. One can always use yet another hi-cap 9mm (right now I only have one). Incredibly reliable, decently accurate, good build quality and decent finish. Actually, this placement is only if it is the blued model, I hate the stainless finish on Taurus autos (their frames are aluminum alloy and something about the particular stainless finish they have over the aluminum just doesn't look good to me), if it is stainless it would move down one.
4) S&W. I love Smith revovlers, I love .357s, but I have a few already so it wouldn't be a priority (now if it was a 3" it might move up to 1 or 2).
5) Ruger KP90. Bulky, kinda "cluncky" but 100% reliable. I also love the caliber. The Ruger auto that I am most likely to own (looks and feel similar to the KP89 that I sold but actually accurate unlike my P89).