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[jdrakeh]

Unfortunately, in the d20 department, d20 Modern (or Modern 20, from RPG Objects) is pretty much it for modern-ish games. If you're open to other systems, however, I recommend Against the Darkness, Blood, or Chill (now OOP). Indeed, Chill matches your description exactly. You can pick up the core book pretty cheap at places like Noble Knight. I'd go with the Mayfair edition if at all possible.