Which calculator is more helpful? 
http://btcinvest.net/bitcoin-mining-profit-calculator.php
vs.
http://mining.thegenesisblock.com
http://btcinvest.net/bitcoin-mining-profit-calculator.php
vs.
http://mining.thegenesisblock.com
https://docs.google.com/spreadsheet/ccc?key=0Auya3iRE6az1dDc0UVgwMU52YVpTazVjSHByOGNiWHc&usp=sharing
From:
https://bitcointalk.org/index.php?topic=236050.msg3050458#msg3050458