Everything looks good. However, I would suggest the HAF 922, saves you 50$, and is still very big. I have mostly your whole build, it is good.
You probably don't need 850, I have a AX650 and can run everything fine oc'ed. I would probably get a 1TB HDD just cause, but if 500gb is all you're going to need, then hey, get it. Also, I think this is personal preference, but I like the EVO better than the plus, due to the design of the bottom.