Hmm I see can I evan fit 2 PSUs in my case? I would have got a 1500W if I knew I was going to get nvidia, But I was planning on going ATI.
a. try to fit a second PSU to bottom of your PC-P80
b. sell your 1200W and buy a 1500W
c. keep the 1200W to power 3 GTX580s and buy Thermaltake Power Express 650W to power the 4th GTX580. This will occupy two 5.25'' drive bays.
This unit is perhaps only a slightly above average unit but it will get the job done.
Official link: http://www.thermaltakeusa.com/Produc...6&ID=1544#Tab0