As stated before, you can pair the rear from this sight set:
with the XR front sight that can be purchsed separately.
Not the cheapest option, but probably the best balance of speed/acquisition/precision for an iron-sighted carry gun for my taste. As previously noted by @redpillregret , the front (while much larger than a fiber optic) is robust and accomplishes the same idea as a fiber optic. The XR is a thinner front sight than the HD which I like.
You asked about Vickers sights...that's a U-notch rear; I touched on that above. Some like it, some don't. I gave my reasons why I don't.
XS Big Dots...don't like 'em. Sure, they can be used to decent effect with enough practice and I've watched fairly mediocre shooters drop plate racks at 25y with them...but not without considerable concentration/time penalty. That being said, you can do the same with no sights on a gun if you're committed to making it happen. The XS concept is attractive to shooters that cannot yet fine tune their sight picture on the fly, but when you start applying a timer/pressure most found they have their limits and switch to something else. Two other things you'll hear to validate it: Speed and poor eyesight. Speed is a question of practice...period. Poor/aging eyes are a problem and cut sighting options down quick; however, there's still a vast selection out there and almost certainly a better option that won't limit the shooter.