Phenom II X4 9xx + HD6670, shes theoretically hovering at 150watts average power consumption, peaking at 300watts. a true rated 500watts should be enough imho and still be overkill.
that WD SSD seems to be an old model, looking by the transfer rates 250MB/s read 170MB/s write.
@OP be careful when choosing parts, specially with the rams and gpus, gpus tends to have either GDDR3 or GDDR5 while Rams has its timings, voltage and speed. motherboards too, with their chipsets, peripherals(lan chip , Audio chip, etc) and slots(ram, pci-e, pci, sata, etc).
are you planning to CF the HD6670 later on? if yes check the HD6790, it looks like it wasn't a rebrand but a cutdown HD6850 which supports most of what the HD6670 has to offer, including UVD3 and that sassy HQV 2.0 high score. the performance should be equal to 2xHD6670.
[140$]XFX HD-679X-ZNFC Radeon HD 6790 1GB 256-bit GDDR5PS: hudson(FM1) boards are out, i.e. AMD's new Fusion processors's motherboard.