The NZXT case is a good choice but I gave a better case in its' class - the Arc MIDI has a streamlined, polished look to it, and some unbelievable interior features that aren't found in its' price range - when compared to the Tempest 410 - plus it has front USB 3.0 ports, something the tempest 410 lacks.
I also included a current Z77 motherboard as opposed to the Z68 - which is still a good motherboard, but the Z77 will be far more future-proof as it will include support for new CPUs, RAM modules, and video cards with PCI Gen 3. As far as the GPU goes - the 480 was a good choice 3 - 4 years ago but it is nowhere *NEAR* the same class as the 7950 or 680 is, not even close, research the benchmarks - they pretty much say everything. I still have my GTX 470 and it puts up good numbers but my 7870 runs circles around it.