You have a good build. Just wondering if you plan to SLI in the future? Might be worth it to get a 750W PSU just to be on the safe side (accounting for aging and other future upgrades). I would suggest the XFX Pro 750W. Its Silver rated, semi-modular, and is very reliable.
As for the case, The Haf XM and the Phantom 410 are both good. I like the Corsair Carbide Series better however. Something like the Corsair Carbide 400R or 500R.
Thx for your suggestion, yeah i was actually thinking of getting a higher PSU just in case i wanted to go sli in the future. As for the case you suggested, i will go check it out when i got the time as i'm at work now.