Mental Gear Reduction
Ars Centurion
Seanan McGuire's October Daye series is fairly high fantasy set in the modern world, mostly in the SF Bay Area. It's very readable, although by late in the series (16 books currently, I think), the protagonist has become so powerful that not much threatens her anymore, which takes a lot of the edge off the narrative.The Dresden Files. D20 modern and Shadowrun were the only game settings that really tried to do something with high fantasy to my recollection.
Still, it's a good time, worth checking out. The characters in those books are excellent, written with real clarity.
