You could try something like this..or just go to the list site and pick your own parts.
PCPartPicker part list:
http://pcpartpicker.com/uk/p/s9C9
Price breakdown by merchant: http://pcpartpicker.com/uk/p/s9C9/by_merchant/
Benchmarks: http://pcpartpicker.com/uk/p/s9C9/benchmarks/
CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor (£168.89 @ Amazon UK)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler (£26.65 @ Scan.co.uk)
Motherboard: ASRock Z77 Extreme4 ATX LGA1155 Motherboard (£101.98 @ Dabs)
Memory: Corsair Vengeance LP 16GB (2 x 8GB) DDR3-1600 Memory (£59.98 @ Amazon UK)
Storage: Western Digital Caviar Blue 500GB 3.5" 7200RPM Internal Hard Drive (£44.96 @ CCL Computers)
Storage: Samsung 830 Series 128GB 2.5" Solid State Disk (£79.34 @ Scan.co.uk)
Video Card: Gigabyte Radeon HD 7870 2GB Video Card (£189.40 @ Amazon UK)
Case: Cooler Master CM 690 II (Black) ATX Mid Tower Case (£74.58 @ CCL Computers)
Power Supply: Corsair Enthusiast 650W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply (£71.58 @ Scan.co.uk)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer (£12.92 @ Scan.co.uk)
Monitor: Asus ML239H 23.0" Monitor (£148.16 @ Amazon UK)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) (£72.30 @ CCL Computers)
Keyboard: Gigabyte Force K3 Wired Gaming Keyboard (£22.93 @ Amazon UK)
Mouse: Microsoft 4YH-00001 Wired Optical Mouse (£8.36 @ Scan.co.uk)
Total: £1082.03
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2012-12-12 17:32 GMT+0000)