I just bought the same power supply (Corsair CX600) for the AntMiner S1.
It looks like there's only 1 PCI-E wire with two 6-pin connections.
Is it safe to use that 1 cable and connect to 2 boards of an AntMiner?
For the power supply, Fry's had refurb
Corsair CX600Ms for $47. It's a single-rail design, so it ought to have no problem running an AntMiner.
I run my AntMiners off of Corsair CX600, not the M, at 200 GH/s without issue (one per miner).