1DiceBack case sensitive has a difficulty of 50,656,515,217,834, or 50 trillion. Using his rate of 0.0025BTC/trillion, it would cost you 0.125BTC, and would probably take a few weeks at least to find. 1DiceBack insensitive has a difficulty of 778,316,249,440, so it would cost you ~0.002BTC. Could get you a very ugly address though, like 1diCEbACk. This is all going off the rates on his thread.