Coincraft A1.
However, btc dropped to 650 dollar. Mining will not be really profitable at the moment.
I suppose it's all down to difficulty speculation. I wonder if/when people start turning off their Block Erupter Cubes / Blades / USB miners - it might actually be sooner than most of the new 1-2TH rigs are delivered. But who knows.
Yeah, the current drop just made the S1 a bit cheaper $-wise - I wonder if that's worth a gamble.