Another one I like as well...

http://btcinvest.net/en/bitcoin-mining-profit-calculator.php

With the price drop (therefore increasing amount of BTC to purchase ANY miner) it is impossible almost impossible to find any calculator that shows buying ANY mining gear (not singling out ST here) will be profitable (i.e., you will earn more BTC than you paid).

That is really a shame as I SO wanted to get some of their miners but cannot rationalize the expense