New equipment is coming out from bitmain https://www.bitmaintech.com/productDetail.htm?pid=0002016052907243375530DcJIoK0654

Electricity cost based on that unit is only like 100 bucks per coin, http://www.coinwarz.com/calculators/bitcoin-mining-calculator/?h=14000.00&p=1500.00&pc=0.10&pf=0.00&d=209453158595.38100000&r=25.00000000&er=674.90000000

Realistically, I would put a guess around the 400 to 600 range after the halving, no reason to be over 800 max...

Personally, I'm quite happy to see some rationality this time around,

"As low as possible for as long as possible."