Since many folks don't get that most pistol fixed iron sights used to set for POA at 50 yards/meters, raising the aft sight is exactly the same as filing down lowering the front sight. So using the highest rear sight may be advantageous to those of us with Old Eyes that can't qualify as experts at over 15 yards nowadays. But since I've gone to the Hellcat with the oversized XS style front, I might consider XS sights. Yet they seem to cost as much without gunsmith installation as the pistol is worth on the market nowadays . Bother!
I've only seen sights listed for the P Series from Meprolight and Trijicon. I've seen one other on a used P97 slide that was neither of those, and looked totally different.
I think Meprolight has a wider range and the only ones I have any experience with. Actually, it looks like Trijicon doesn't offer for any P Series anymore.
The sights across the P Series vary in rear sight height. P85 and P89 are the lowest. P94 and P97 are listed as the middle height. The one mentioned above the tallest.
I put Meprolights on my P89 sometime between 97 and 00. The white circles around the vials are much more visible than the tiny painted dots on the stock sights. On the P89, they were as true as the stock sights. They finally went dim, I replaced them, and the new sights are true.
I have been fighting with a P94 for a while that hits low; Several inches, and it should be no more than the sight height of 5/8 inch.
I swapped on the taller rear sight and it is 2/3rds of the way to correct.
I measured and did drawings, and I am coming up with some different geometry from the stock sights.
I bought a bore sight and started checking things, though I can't check longer distance. It's putting the red dot right at the top edge of the front sight at close range on everything I own. I'm willing to entertain that I'm not any good, but the P94 was true before the sight installation, it's true when I swap on a slide with the original sights, and the P89 and LC9s are true.
XS Sights do not offer anything for P Series. I don't think they were around back when they were still available, and they're not likely to have that one on their to-do list.
I haven't shopped P95s. P94s with the less desirable manual safety are going for almost $400 today, after years of rampant inflation. P89s are close to that. I can't see P95s being much less.
Meprolights are ~$100.
I'm ending up doing sights, grips, springs, and triggers on everything just to put it like I like it.