I am very partial to the Supers20 system, based off of Modern20. It is a wonderful system that is very easy to adapt to any hero type world.
Here is a link to the posts of bad guys we have been making....
http://www.enworld.org/forum/general-rpg-rules-discussion/235183-supers20-q.html
http://www.enworld.org/forum/general-rpg-rules-discussion/240466-supers20-bring-bad-guys.html
RPGNow.com - RPG Objects - Supers 20
Here is a link to the posts of bad guys we have been making....
http://www.enworld.org/forum/general-rpg-rules-discussion/235183-supers20-q.html
http://www.enworld.org/forum/general-rpg-rules-discussion/240466-supers20-bring-bad-guys.html
RPGNow.com - RPG Objects - Supers 20
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