Rough decent build from a UK website (Self assemble, much easier than it sounds ;) ).
You could get a NVIDIA GTX 770 instead, but it pushes you close to your budget limit (not sure on conversion rates + your tax rates, we have 20%). Or you could get an AMD card, they tend to be slightly cheaper.
Try and find a local computer part website, aim for similar parts. (Or try and go for better rated parts).
Hopefully it will be cheaper with less tax!
Note: Motherboard doesn't support SLI (2 x Nvidia graphics), but it does support AMD Xfire. However you would also need a new powersupply. (current is too small for 2x)
And you won't be able to upgrade to a different generation of CPU. (Though this should be fine, and the intel 4670 isn't much better)
Also you should get a better cooler for the CPU, I use the Zalman CNPS10X-PERFORMA for my intel 4770k. (It was ~£25 and works like a dream, and you can stick a second fan on it easily!)
Side note: Build you posted is OK, just seems a little expensive. (All pre-built are :/)