The only reason for buying the newer model, rather than the "plain 'ol" FS model is the ability to change-out the front sight on the newer model without having to send the slide to a machinist.
Even with the "modernization" of the Beretta line, they are only just catching up on the sights.
Don't know whether factory tritiums are available in any model except the one that they are getting north of a grand for at this point.
(model 92G-SD)
I'm sure none of the factory guns are using fiber-optic, let alone something like the Truglo TFX, which uses BOTH methods of sight illumination.
The only reason I can see these days for using plain black sights is for something along the lines of bullseye pistol (a truly dwindling firearm discipline).
...and then you would want big adjustable national match type sights, which I don't think Beretta offers on any factory models these days anyway.
As for that fancy new model that they are getting a grand for, am I wrong for thinking it is absurd that people are paying a grand for a metal-frame double-stack 9mm just because it has most of the features that have been on other guns with similar features for the better part of a decade? I like Beretta guns a lot, but I just can't abide paying a "stupid" tax.
...and I don't want that DAMN RAIL on the frame of my Beretta!