AntMiner S2 1TH/s Miner (1w/GH/s) Batch 2
Price: 3599 USD ( 8.065 BTC )
AntMiner S1 180GH/s
AntMiner S1 - 0.893BTC
1000/180= 5.56
AntMiner S2 = 6 AntMiner S1
8.065 BTC > 6 x 0.893BTC
8.065 BTC > 5.36 BTC
so buy AntMiner S2 or 6 AntMiner S1 ?
will be ROI if buy AntMiner S2 or 6 AntMiner S1?
You also forgot to factor in 3000w worth of PSU, or something close to that if you intend on over clocking. My two S1's are pulling in over 900w combined.
Just to reiterate: the S1 does not come with a power supply, the S2 does. You need to add the cost of PSUs for your 6x S1s. Also the price of BTC at the time the S2 was on sale, as someone else has mentioned.
It doesn't really make sense to talk about the price of S2 at the moment since they are not for sale (yet). When batch 3 is opened I imagine they will be cheaper than batch 1 or 2.