For that money you may look into a red dot optic. You may actually find it more enjoyable to shoot. Check out the Primary Arms red dot (Aimpoint micro knock off).. if your haven't tried, you're completely capable of grouping at 100 yards with it. Just stay with a small dot. (2moa)
I have a pile of factory Glock sights. None of them are metal though. For the money you'll spend on getting them, I would just wait for a internet deal on a set of 3 dot night sights. You're only a bit more, but rock solid, and glow at night.