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CPU: Intel Core i3-3220 3.3GHz Dual-Core Processor (£81.65 @ Aria PC)
Motherboard: ASRock H77 Pro4-M Micro ATX LGA1155 Motherboard (£64.58 @ Amazon UK)
Memory: 2x4GB DDR3 RAM (£28.00 @ MemoryC)
Storage: Seagate Barracuda 500GB 3.5" 7200RPM Internal Hard Drive (£40.20 @ Aria PC)
Video Card: XFX Radeon HD 7850 1GB Video Card (£130.54 @ Scan.co.uk)
Power Supply: XFX ProSeries 450W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply (£35.00 @ Ebuyer)
Total: £379.97
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2012-12-16 15:05 GMT+0000)
You don't necessarily need to go lower on the RAM, but the option's there. Any of the sub-£30 stuff would probably do you fine.
I hear the XFX 7850 is surprisingly good. I've usually avoided XFX GPUs due to suspiciously low prices, but apparently the cooler is good and very quiet.
A 550w PSU is enough to run two 7850s, so 600w for one is too too much.
What kind of case do you like? Flashy or dignified?