Another thought in favor of the patridge front sight is that if you don't like the "all-black" sight picture, it's a very simple matter to apply flourescent orange paint to the rear (vertical) edge of the patridge sight. In that location, it doesn't rub off even if you holster the gun. I did that with a 617 and really like the results. I have a S&W mod 610 with a fiber-optic front sight, and the model paint is just as bright outdoors as the fiber-optic sight.
There are threads on here about how to do it, but basically after degreasing the blade with acetone, I use a coat of flat white Testors model paint, followed by a coat of their flourescent orange. Looks great and is easily removable with solvent if you want to go back to black.
Lou