SP-30 is a good deal.

But I do not pay so much for things that have already been sold cheaply - SP-30 group buy

I look forward to Antminer S3, which will be sold in a few months.

Should not be ignored - S2 is Upgradable
All AntMiner S2 and S2 kit will be adapted to the Hash Boards with next generation chips. Clients can freely choose the upgrade version Hash Boards to replace the ones in hands.

So I buy only new blades for S2