what is your budget? you can probably do a heck of a lot better than that for the money, no offense.
The worst choices that you made imo was the GPU, PSU, and motherboard (in that order)
also the antec 300 is decent but very meh imo, OCZ psus are crap, and the gpu you picked out is very underpowered, also the motherboard is not a good choice for the money imo, also Id get a smaller WDC Black sata 6gbps HDD for the moeny
If you give me your budget I will assemble a build for you