Ther SP20 says it gets about 1.7TH with a power consumption of 1200 watts... So about the same power consumption, with 200gh more power and $200 more in price... Right now, anyway...
However, if you do the math, the faster delivery should actually make up for that $200 within the month, and will be a tad more future proof... Maybe this is decent.
Touch decision, IMO. But S3's are typically going for like $200 each. Some are that plus shipping. You'd pay more for less hashing power, but in-hand... Then again, I only have a PSU to power one... Damn, if this A1 was in-hand, I'd pay for it in a heartbeat, you know?
Shoot...
the sp20 gets 1350gh with 750 watts
the 1200 watt 1700 gh is with a monster overclock .
you spend 450 watts to get that last 350gh.
I have a very long detailed thread on the sp20. if you have a 1000 watt psu in hand the sp20 is a good deal
https://bitcointalk.org/index.php?topic=872014.0if you have to buy a psu it is not a great deal.