I have two shotguns I use for home defense and night shift police patrol. One is minimalist, indeed, an 870P, with the only substantial changes being a Vang safety, and a Speedfeed "LE" forend, which is nice and slim; my fingers are not long. It usually wears a Vang-Comped barrel, for tight patterns, but that is for streetfighting, when I want tight patterns. Home defense does not require tight patterns. The sight is a simple bead, which is fast, and works well for sighting from either shoulder.
My other shotgun is quite a custom weapon, an 870 that was given a package treatment by Scattergun Technologies, including a ghost-ring rear sight and tritium front sight. This sight set-up is not as fast, for me, as a simple bead, and works well only from my left shoulder, as I am left-eye dominant. I bought this mostly as a slug gun, for longer-range use. It is not my favored in-home weapon, though it would be quite fine for sitting and waiting for a bad guy, when I will not be switching shoulders, as I do while hunting a bad guy indoors.