Dual gtx 260 power supply


That should work
Cons;
Loss of a drive bay
Loss of a pci expansion port
Extra AC plug
Added heat source
Extra fan noise

One of these would cost a little bit more but would be a better option overall
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139006
http://www.newegg.com/Product/Product.aspx?Item=N82E16817341011
Pro's
All of the pcie connectors you need
No loss of drive bay or expansion port
No extra heat or noise source's ( may even help to lower both temps and noise )