I believe night sights are an over-rated accessory.
If it's too dark to see the sights, how do you know what you're shooting at? If it's light enough to ID the target, or you have a flashlight, then it's light enough to see the sights. I have them on the majority of my carry guns because they came on the gun. I've never replaced sights with night sights.
If you're buying sights, take a good look at Warren Tacticals. Yes, they are available in tritium, but the plain old black ones are fine. They are dramatically thinner in front than OEM, and tough as nails. Scott makes them a bit over-sized, so you need to file them to fit. They have a set screw and the front secures (as most do) with a thin walled 3/16" socket.
I have racked the slide using the rear sight on my holster A LOT. Use a belt, use the mag pouch weak-handed, it doesn't matter. They're still factory black and shooting straight.