That's a really nice build. I actually have the Athlon 750k overclocked to 4.1 GHz and it's brilliant.
The GPU and everything else is quite well balanced altogether.
However, I would seriously recommend changing that PSU. Corsair's CX series PSUs are built using extremely cheap, low quality capacitors. I was surprised when I found that out, because Corsair usually make such good products.
Anyway, here's a PSU from XFX that has a much better build quality, and is pretty much the same price as the CX 500w:
http://uk.pcpartpicker.com/part/xfx-power-supply-p1550sxxb9
If you are loyal to Corsair, you could get one of their other PSUs. They are built with good quality, it's only the CX series that's bad. However, Corsairs' other PSUs are expensive and have a lot of wattage, which is much more than you need, but it's up to you.
I would agree that the 300r Case is far better than the 200r as well:
http://uk.pcpartpicker.com/part/corsair-case-300r
OR
http://uk.pcpartpicker.com/part/corsair-case-300rwindowed - If you want to show off your parts
I hope this helped!