Nroce4 power supplies

[Spartan Mustang]

I have desided on buying DFI's nforce 4 SLI-DR motherboard. I have also bought a BFG 6800 GTgraphics card and plan on possible buying another one in a year or so. I want a power supply that will be powerful enough to power two of these cards. So i need help finding a good power supply for this mobo and graphics card. Iam not sure if this new DFI board has the new ATX 2.0 power supply spec. ( its a PCI Express board so iam guessing it does) So will i need to buy a power supply that works with this new spec. I really need some good advise on this topic. The power supply is one of my last real questions about my new computer. If you have a good answer about what power supply i should use for this new rig i would greatly appreciate it. Thanks for your time.