of course, i understand that. however, it would not really be in bitmain's interests to start up another R&D plus production line for an S1.5 model.
you can do any of these right now:
Buy 3 antminers and undervolt = 400GH / 500W / 2.7BTC
Buy 2 antminers and no overclock = 400GH / 800W / 1.8BTC
Buy an antminer S2 unit = 1000GH / 1kW / 6.3BTC (sold out, and will take about 10 days longer to receive a batch 2 even if you did order)
Buy 7 antminers and undervolt = 960GH / 1.1kW / 6.5BTC
personally, the S2 makes sense if you want:
a) included PSU ($200 expense for nice ATX vs $50 if you were modding server gear)
b) fewer cords (1 ethernet and 1 power, verses 7 ethernets for a comparable hashrate of underclocked S1 units)
c) simpler control (1 IP address rather than 7)
d) better density (S1 units can be a bit tricky to stack and have wires going in all directions to the PSU)
I ordered a batch 2 unit, but in retrospect almost wish i went with multiple S1 units instead. REALLY hoping that the S2 can overclock past 1.15TH if given good airflow and an extra 300W
on that note: I would be willing to sell my Batch 2 pre-order at the right price - PM me if you want to offer AT LEAST 6.85BTC for it