If you don't need some sort of night sight take a look at the reviews for the Ameriglo Defoors "Tactical" sights. I've had them on a couple of Glocks and like them a lot. They're plain black steel sights with a slightly narrower front sight that for my eyes give a very clear easy to obtain sight picture and are under $40. I've got no trouble hitting 50 yard torso sized targets with them pretty consistently.
