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@TheShaman: I think full-on CGI (no people at all) would be the way to go. It gives you a gritty sense of realism, but doesn't cost $250 million, which is what THE ROOKIE would cost to make (thereabouts). For a great example, check out STARSHIP TROOPERS; INVASION. http://www.imdb.com/title/tt2085930/?ref_=sr_2