IMDB Searches

For future reference:
num_votes = min, max
sort = user_rating, desc
year = min, max
genres = sci_fi (action adventure animation biography comedy crime documentary drama family fantasy film_noir history horror music musical mystery romance sci_fi short sport thriller war western)
title_type = feature (movie)

Highest Rated Sci-Fi Feature Films Released No Later Than 2012 With At Least 20,000 Votes
http://www.imdb.com/search/title?num_votes=20000,&sort=user_rating,desc&year=,2012&genres=sci_fi&title_type=feature