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Well, CPU & GPU power is based of the 12V lines.
You could get a small cheap 430 watts Corsair CX supply and this one.
Connect both supplies ground to each other and switch both supplies on with the same switch.
The small supply would handle 3.3V, 5V and motherboard 12V lines, while this monster handles 12 Volt for the CPU's in a 4p setup and GPU's sucking up the remaining power.
Sadly I have to pay approx $200 in shipping if I go for this auction to build such a setup.