from you're first post :
# Graphics Support: PCI Express x16
so yeah pci-e(xpress) is fine.
i'd go for the 3850 over the 8600.
depending on you're budget/discount u might be able to get a 3870, just a thought
psu i quoted will run that lot ok.
Cheers bud.
Final question, does PCI-EX 8600 need power from the PSU? How do i know if a processor I'm getting has different cords for my graphics card? whats the proper name for the cords?