I'm Canadian, so the whole pounds thing messed up my head a bit, lol, this should be a good build. I added an HDD and Windows 7 to this build, but, since you didn't put that in the OP build, I'm not sure if you need it?
Get the Bitfenix Shinobi, or HAF 912. Downgrade to a 500GB HDD. Try to squeeze in a 6870.
Thanks alot, and Dw about the OS i already have win7. Thanks guy You've helped me a ton:) It's my first build so i don't want to waste my cash:P