750W Corsair won my vote, 62A on a single rail, should happily supply four of them.
Does it have 8 molex? If not I'd be careful, I don't think we can power a blade with a single model worth of cables and deliver 10A.
I'm planning on using the PCI-e connectors (it has 4) - chop the plugs off and use the wires straight into the blade connector blocks. For some safety factor I could use a molex cable as well into each blade but I don't think that'd be necessary?
I'll just monitor the wire temperature like a hawk for the first few hours