How is this for a match made in Hell. A Innosilicon a2 mated with a BFL PSU?
I have already created several of these Devil spawn.
Butterfly Labs BFL 1250W 80+ Gold ATX Fully Modular Power Supply New Sealed Box. $100 + $16 shipping.
http://www.ebay.com/itm/Butterfly-Labs-BFL-1250W-80-Gold-ATX-Fully-Modular-Power-Supply-New-Sealed-Box-/162251676596?hash=item25c6f41bb4:g:1TkAAOSwnGJWT4H1It has 6 8 pin PCI-E connector ports, the voltage passes through with power to the 4 pins on the clip side of the connector at the card. additionally if you have a bad cable you can use one of the 2 CPU cables that comes with the PSU.
You just need to cut the spline between pin 5 & 6 on the A2s power connector so it will go in the PSU.
Works like a charm, and the price is right.
Good Luck!