Unknown Armies, specifically 2e:

Urban fantasy but the conspiracy theorists had it right. Rather than cosmic horrors threatening the world, the horror here comes from human action. Magic exists, but to practice it you have to be a bit mad and in the end its not always as effective as a sane, well adjusted person just using modern technology effectively. Power has a cost, and pursuing it might well have you end up on the streets holding up signs saying the end is Also has the probably the best designed sanity system out there.