I agree. The racking sound of a shotgun is quite impressive, although not as much when you hear two faint clicks of safeties being clicked off in the living room. I'm sorry. I will never, EVER let someone know I'm about to end their life. I'm a cop, and maybe my training has something to do with it. I'm like Gabe over on warrior talk, shoot them to the GROUND. Get a good pump shotgun(remington 870 is MY personal pref.), put a light on it and LEAVE IT ALONE. You don't want it looking tacti-cool, that'll get you eaten alive in court. If you are asked about the light in court, say you were using it to be able toidentifyyour neighbor in need of sugar from an intruder(yeah, right). I have tritium rifle sights on mine, but again thats a personal thing. A tritium bead could be your thing as as could be tritium ghost ring sights(if you find them, let me know). And one more time,for gooodnesssakes don't let the badguy know your coming armed, just get in the fight and stay there until you win. If he is not courteous enough to knock, i'm not courteous enough to give him a warning.

EDIT TO ADD
A buddy of mine killed someone w/ his duty gun. His gun had a modified trigger, was a 3.5lbs trigger on a glock. When the attorney made mention of it, he claimed he could not accurately shoot his duty gun w/ the 5.5 trigger. He even went on to say that his department's qualifications were not enough to prove to HIM that he could accurately shoot ONLY the badguy w/ his duty gun. In order to not kill a 7 or 8 year old, he made his gun easier to shoot. If you use this testimony in court one day for whatever reason(say, the light), make dang sure you didn't kill little suzie. It just will make your life hard. Also, did i mention you need to shoot the guy to the ground???