This is similar to Indie's build, better processor but B grade Motherboard.
1 x Intel Core i5-3470 3.20GHz (Ivybridge) Socket LGA1155 Processor (77W) - Retail £149.99
1 x Sapphire HD 7850 1024MB GDDR5 PCI-Express Graphics Card w/ FARCRY3, Nexuiz & Sleeping Dogs PC Games £149.99
1 x **B Grade** Asus P8H77-M Intel H77 (Socket 1155) DDR3 MicroATX Motherboard £70
1 x Crucial Ballistix Elite 4GB (2x2GB) DDR3 PC3-12800C8 1600MHz Dual Channel Kit (BLE2CP2G3D1608CE1TX0CEU) £29.99
Total : £411.36 (includes shipping : £9.50).
You will also have to pay for shipping on Indie's build, like mine, as you do not have 250 posts.
Don't be affraid of BGrade, they are fully functional products, just may have missing packaging or accessories. Most of which custom builders don't use anyways.
Z68 does have pci-e Gen 3 though. Not a big loss but the card won't run to its full potenial.