I'm using a corsair 500w power supply.  One thing I did change last night was that I was running the pci-e off 1 daisy chain, it has 2 connectors.  I had ordered a molex to pci-e connector so I switched one pci-e connector on the units to one powered by 2 molex connectors.  Its probably safer like that.  Overall the unit is running very nice, I sold my scrypt mining setup and have more ants on the way.