I would recommend a little better RAM, like G. SKILL RIPJAW Cas7 DDR3 1600. The rest build looks good. If you follow my step-by-step guide in my signature, you should have no issues building your PC. If you have questions, you can always PM me or another of the "vets" in the Homebuilt section and we can help you out.
why a WD Green? I would go with Black since it had both bigger cache and fast speed. and i think price is about same or $5 difference? If you know how to put it together than do it yourself. Its not difficult and saves money instead of having company do it.