There are a number of interesting articles about the decision to receive or defer. Below is one of them. From the stats cited in the article, it seems that team that choose to receive the kickoff first on winning coin toss actually do less well than those who defer.
"....Since the start of the 2010 season, flip-winning clubs that have opted to receive first are 185-209 (.470), versus 140-115 (.549) for those deferring."
Read More: http://sportsillustrated.cnn.com/2012/writers/jim_trotter/11/15/coin-flips/index.html#ixzz2e7tTvwPG
link to SI article