See edits. Still isn't worth it...

Further Edit:

Efficiency Setup - at equal power use for comparison without power costs impacting the analysis.
Card   Price   Hash/s   Power (W)   H/$
1070  $400    330        95             0.825
Fury   $260    285        95             1.096

Full Bore Setup
Card   Price   Hash/s   H/$
1070  $400    430      1.075
Fury   $260    350      1.346

The 1070 has a long way to go before it's worth a look.  The entry cost of $400/card is just too steep to overcome without some serious hash.