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Since you don't have enough to think about, I'll add one more thing.

I much prefer a conventional stock instead of a pistol grip with or without a stock. Its what I'm used to and, for me, works better for recoil control. Also, it works better for instinctive shooting (again, for me).

One side benefit is this... If you ever find yourself facing someone who just desperately needs to be butt-stroked, you can do it without having to alter your grip.

Cabela's has the Winchester® SXP Defender for $329 (20ga) or #309 (12ga). For a shotgun that is only used for Home Defense, that wouldn't be a bad choice. There are very few accessories available for it, but that doesn't seem to be your focus. If you want to accessorize a shotgun, then go with a Mossberg 500/590 or a Remington 870.

Whatever you decide on, just know that a pump-action shotgun will almost always recoil much harder than a semi auto. As Crossfire said, that isn't much of a consideration for home defense, but just like your EDC pistol, you really should shoot a shotgun quite a bit to ensure it is reliable.