The case you showed already has a power supply with it.
The AMD Athlons are like the Intel Celeron's.
The 9600GSO isn't too good.
The RAM is pretty slow (667 MHz), the RAM you chose is DDR2, the motherboard is DDR3.
Plus, with the looks of this thing, you won't be using the SLI/Crossfire the motherboard supports, so you could probably get a cheaper motherboard.