As I voted in August 2012, with the final results here. Obviously, some of this has and will continue to change, and eventually, I'll reassess how this would rank with additional blind spots covered and evolving preferences, and post another list reflecting that. This window into time, however, stays permanent, for your reflection and mine.
The determination for what qualified as a 90s film was this: Anything that played theatrically - festivals included - in the United States for the first time in the 1990s. Hence, The Decalogue, The Killer, Santa Sangre, etc.