what i think an antminer s7 would be:
5.58THs to 4.68THs
power under 1500watts
price 825 to 975
just my two cents
nah, what you described is more like S8
S7: 2300-2400 TH, 505-550W
... but the $975 price point might be right

Let's be realistic here, Bitmain is not going to sell a twice-as-efficient miner for LESS per TH/s than the S5. So if the S5 is now $380 (on Hashnest) that's $330 per TH/s. It's likely the S7 would be around $400-500 per TH/s, depending on the BTC exchange rate.