Ok heres what i managed to put together for under £1000
Corsair Carbide Series 300R Black Mid Tower Gaming Performance Case with USB 3.0, w/o PSU
£44.30 £53.16
http://www.scan.co.uk/products/corsair-carbide-series-300r-black-mid-tower-gaming-performance-case-with-usb-30-w-o-psu
650W Corsair PSU, CMPSU-650HXUK, Modular, 85%Eff', 80 PLUS Bronze, SLI/CrossFire, EPS 12V, Quiet Fan, ATX v2.2
£72.65 £87.18
http://www.scan.co.uk/products/650w-corsair-psu-cmpsu-650hxuk-modular-85eff-80-plus-bronze-sli-crossfire-eps-12v-quiet-fan-atx-v22
8GB (2x4GB) Corsair DDR3 Vengeance Jet Black, PC3-12800 (1600), Non-ECC, CAS 9-9-9-24, XMP, 1.50V
£34.12 £40.94
http://www.scan.co.uk/products/8gb-(2x4gb)-corsair-ddr3-vengeance-jet-black-pc3-12800-(1600)-non-ecc-cas-9-9-9-24-xmp-150v
Intel Core i5 3570K,1155, Ivy Bridge, Quad Core, 3.4GHz, 5 GT/s DMI, 650MHz GPU, 6MB Smart Cache, 34x Ratio, 77W, Retail
£144.95 £173.94
http://www.scan.co.uk/products/29-4intel-core-i5-3570k-s-1155-ivy-bridge-quad-core-34ghz-5-gt-s-dmi-650mhz-gpu-6mb-smart-cache-34x-
MSI Z77A-G43, Intel Z77, S 1155, DDR3, SATA III - 6Gb/s, SATA RAID, PCIe 3.0 (x16), D-Sub/ DVI-D/ HDMI, ATX
£63.77 £76.52
http://www.scan.co.uk/products/msi-z77a-g43-intel-z77-s-1155-ddr3-sata-iii-6gb-s-sata-raid-pcie-30-(x16)-d-sub-dvi-d-hdmi-atx
1TB Western Digital WD10EALX Caviar Blue, SATA 6Gb/s, 7200rpm, 32MB Cache
£64.60 £77.52
http://www.scan.co.uk/products/369581tb-western-digital-wd10ealx-caviar-blue-sata-6gb-s-7200rpm-32mb-cache
120GB Corsair Force Series 3, 2.5" SSD, SATA III - 6Gb/s, SandForce, Read 550Mb/s, Write 510Mb/s, 85,000 IOPS, PC/MAC
£75.12 £90.14
http://www.scan.co.uk/products/120gb-corsair-force-series-3-25-ssd-sata-iii-6gb-s-sandforce-read-550mb-s-write-510mb-s-85000-iops-p
Samsung WriteMaster SH-S222BB/BEBE 22x DVD±R, 12x DVD±R, DVD+RW x8/-RW x6, SATA, Black, OEM
£10.98 £13.18
http://www.scan.co.uk/products/samsung-writemaster-sh-s222bb-bebe-22x-dvdr-12x-dvdr-dvdplusrw-x8-rw-x6-sata-black-oem
2GB MSI GTX 670 Overclocked, 28nm, PCIe 3.0 (x16), 6008MHz GDDR5, GPU 965MHz, Boost 1045MHz, Cores 1344,
£257.67 £309.20
http://www.scan.co.uk/products/2gb-msi-gtx-670-overclocked-28nm-pcie-30-(x16)-6008mhz-gddr5-gpu-965mhz-boost-1045mhz-cores-1344-2xd
Corsair Cooling Hydro Series H60 High-performance CPU Cooler, LGA1156 / 1155, LGA775, LGA1366, AM2 and AM3
£43.60 £52.32
http://www.scan.co.uk/products/corsair-cooling-hydro-series-h60-high-performance-cpu-cooler-lga1156-1155-lga775-lga1366-am2-and-am3
Total£983.69
You can spend the left over cash on an extra couple of fans, another 140mm for the front, and another 120mm to add to the H60 so you can set up a push pull config.