Modern Day Witch Hunter idea

For some time now I have been infatuated with the idea of witch hunters (primarily the interest grew from an old character of mine from the Elder Scrolls: Oblivion and just became my own little brainchild) and I thought to myself "Self: wouldn't it be interesting to see what a group of modern day hunters would be like?" and thus this idea was brought to life.

The concept of the game would revolve around rooting out the evils that have been making themselves known in the modern world: vampires, werewolves, cults dedicated to summoning evil gods and whatnot... basically anything evil needs to be eliminated before they become a threat. Characters would not start off knowing each other and would be brought together for a common goal in eradicating the monsters that threaten to plague our world.

I would be using a lot of information from the D20 Modern books such as classes, races, etc and characters would be free to model their characters any way they feel like.

I am still debating on playstyle however, wondering if I should have character sheets of the players (written ones) and keep track of their skills and the like and make DM rolls during larger or more integrated moments of the campaign.

Please let me know if this interests anyone and what concerns you may or may not have.

Thanks in advance!

-Brony

Sweet, this sounds like a cool idea. This has my interest.