Hello there,
The SureFire M95 coupled with a LaRue Tactical LT-170 QD mount is absolutely bombproof and more than you'll need for home defense lighting. $ 421.00. Just run the pressure pad to a regular foregrip and you're good to go.
Not a fan of the foregrip/light combos thus far... they seem a bit unwieldy and bulky. The Crimson Trace setup is actually very wide, which at least in my hands made the front end feel a bit... off.
A great sight that can co-witness with your irons is an Aimpoint Micro H-1. Get the optic and a "tall mount" (LT660) mount from LaRue Tactical for the co-witness. You can leave the battery on at all times at the lowest setting and have something like 20,000 battery hours from it. If you want to leave the battery off to power up you turn a big ol' knob on the side of the optic... so easy my 9 year old can flip it on and be good to go in seconds. Around $ 600.00.
Just my two cents... holler if I can be of any help. Certified armorer for ARs so if you have any tech questions I'd be happy to help.
Stay safe,
don