Well, FATE seems to fit the setting pretty well, but I can think of at least two other rule sets that would fit.
First, there's In Nomine from Steve Jackson Game. I'd use the following mapping:
Evocation magic is Coporeal Songs.
Thaumaturgy is Sorcery; some addition skills/rituals necessary.
The Nevernever is the Ethereal and all its denizens.
The various vampires can be handled by various Discords.
You'll need to decide if the "known" supernatural landscape is accurate or if the default IN cosmology applies.
Voila; instant campaign setting.
Second, a d20 system could work. Before I heard about DFRPG, I was noodling around with a DF setting. I'd use:
d20 Modern, with the E6 limitations (nobody gets more that 6 levels; add'l XP buys feats)
Green Ronin's True Sorcery for Evocation
The Incantation rules from Zombie Sky Press, Unearthed Arcana, and d20 Modern for Thaumaturgy.
Do some template work for your supernatural races.
Voila; instant d20 setting that can be DF or similar games with the serial numbers filed off.
*Any* rule set can be used for any setting with some work. Shoot, the Friday Night Gaming Group plays Prep and Landing games every Christmas using Call of Cthulhu rules.