Really?? You need more than 630 lumens for house inspection? Well, in order to get a significant increase in brightness from your eyes point of view, you need to DOUBLE the lumens or more.
This means you need one of the Big Boyz. I would actually recommend you consider one of the triple XM-L lights available. I have a TK70 but it uses NiMh Ds, which doesnt really help since you have 18650s already.
I would check out the forums and find a decent one. The DRY 3x XM-L is well known for being driven hard, uses 3x18650s and puts out 2000 lumens or so. Other budget lights exist that are 2x18650/3x18650 and you can get one for under 100 bucks.
If you go with a non-budget light like JetBeam, etc, you will pay a FORTUNE.