The likely outcome of Survivor between members is arguements. IMHO it should be avoided for this reason.
Done with figures would be fun, but then The Rancor Pit is fulfilling that role (ie finding out everyone favourite figure), so perhaps another aspect could be entertained?
My thought is to do it with toy lines (Vinatge, POTJ, Unleashed, Action Masters etc).
Each line could be given marks, out of five say, in a number of categories (display-ability, play-ability etc). Categories are used one per round. Every member gets to grade the lines once in that category and the totals added up. Line with the lowest score gets eliminated.
Then move on to the next category. At the end we find out the members favourite toy line.
Just an idea.