Just my personal opinion, but the last thing I want on a "social" firearm is a xenon bulb that can blow out from age, impact, etc. There are definitely still places for incans out there in the world, but on a firearm isn't one that I would list. I've had xenon bulbs fail on me in the past unexpectedly, but I live a safe and simple life so it didn't bring me any trouble
The above mentioned Streamlight TLR-1 is what I have on my bedside Glock. It is fantastic, in my opinion. I'm a light geek of medium level (not full blood CPF levels willing to spend thousands).
I own many Crees and super bright LED's but the "old" luxeon of the TLR-1 is plenty bright for me. I know it will never blow and it gives me good battery life. I think they run around $100 online (give or take), so really not much more than the Glock xenon light.
SF makes the best, no doubt, but the SL TLR-1 is great. Not as bright as SF, but there's a certain brightness threshold over which I think you're doing yourself more harm than good (depending on location). Since mine would only ever be used indoors, I don't need anything brighter than the TLR-1.
If you've ever woken up in the middle of the night, eyes totally dark adapted, and used a bright flashlight, you will know what I mean. I have blinded myself with my own light, not even by bouncing it off of anything: just because my eyes were SO dark adapted that my illuminated apartment was too much for my eyes.
If you plan to use a weapon light outdoors: that's a different matter. Then the brightest is obviously desirable. For your listed use of preventing home invasion though, you just want enough light to ID targets and possibly navigate.
Not saying the TLR-1 is dim (it is definitely bright), I'm just saying I don't want anything brighter.