Re: AntMiner S2 1TH/s Miner (1w/GH/s) Batch 4 is open for sale
price is still to high 
+1
S1s are now about $200 a pop. For those who are math challenged, that's $1200/TH unpowered or $1560/TH stock with ATX golds.
Sorry to say but price (including costs of PS) and power consumption is not the only means of comparison for product value between S1<>S2.
When Bitmain can also make the S2 as reliable as the S1 and ship it in working order to customers with a lower sale price then I will take notice.