Get a combat shotgun with an 18" barrel and an extended magazine. If you're the shooter, 12 gage pump or semi-auto. If the wife shoots it too, 20 ga., semi-auto. NEF makes some sweet home defense 12 ga. pumps for under $300 [maybe less than $200].
In my concealed carry class, the instructor said NEVER use rifles or shotguns for home defense. Studies show the long barrel is a huge disadvantage in a dark home. Intruders can and have grabbed the long barrels and turned the tables on the homeowner.
And, even with a pistol, hold it close to your body, not stiff-armed outward.
And, with pistols, you get what you pay for. Any name brand gun that you feel comfortable with should be a very good investment.
Thanks, but I want something I can take to the range. Something I can get familiar with.