right i have got a problem. that case i have used for a build before.its a massive case and good build quality.BUT the side fan will disrupt the flow of air inside the case. so get a case with no BIG side fan.i recommend the Antec 900 or even 1200. or you can keep this case and turn up the side fan to cool the system in a brute force way.
That's a very good hard drive. I don't expect any memory issues with that setup.
Are you going to play games a lot? If yes, spend an extra $20 and replace the 520HX with a 750TX. You'd have lots more room for upgrades, including the ability to add a second video card when/if needed.