OK... I'm not going to tell you that having a boatload of guns laying about the house is dumb... 'cause others have pretty much beaten me to it.
I picked the Saiga because it's high-capacity for a shotgun, 10 to 30 rounds
I'm not sure the 10-30 rds is all that necessary, unless you live in a big house on some serious property... and are expecting zombies. Big sideways jump from a Saiga to a Mossy pump... why?
You don't buy into that racking the slide on a pump BS actually scares people... do you?
Don't forget the Mossy 930 SPX... Not a Benelli or FN, but a very nice semi-auto for the money.
The Five-Seven because it has a 20 round mag which can be upgraded to 30 rounds, the flashlight illuminates the way for you and makes the gun front heavy, reducing muzzle rise, and that combined with the red dot will make target acquisition that much easier.
You really got that hi-cap thing goin' on don't ya'. Why? You expecting a tac team?
Flashlight reducing muzzle flip? Man... that must be one heavy flashlight.
You don't want to "illuminate the way"... you want to illuminate the target, then shut the light off and move to cover... you should know the way
Red dot on a 10 yard or less human target? Maybe a little overkill... again, you might live in a house with 30 yd hallways... I don't know.
The USP is more of a secondary idea if the five seven were to be a bad HD gun, the weaponlight is also for muzzle rise, but also fills the purpose of a red dot, which would be difficult to find for a HK, the reason I picked .40 caliber is because the extra stopping power while still actually being a improvement over the USP9s standard capacity because of the mag extension.
There are holo sights for the USP.
Got no issues with a light... but again, muzzle rise is a bit of a reach.
Got no issues with the .40 for HD.
Don't misunderstand brother... I'm not trying to beat you up here, more trying to dispel a few myths and give you a real world perspective.
OK... there's my 2 cents worth of interweb advice, I'll be expecting change back from that ya' know.