That's as good as it gets, well done. Although you could get Windows 8... or a better graphics card- the 7870. But that's all there is.
Hi. Save £13 with DDR3-1600 RAM and spend that on a GTX 660 instead or a little bit more for a different GTX 660 or HD 7870. The small price difference is worth the upgrade especially compared to the rest of your build.