...I am switching to 1070's
Why are you making a switch to 1070's? With the 500 series coming out 400 stock should start to drop in price or is it due to more power and limited pci express lanes.
If you are after zec 1070 is the way to go. If that 'invisible hand' somehow disappears you might end up with gpu which mines well but costs too much.
I think he can keep it to mine ZEC.