Dell have dropped the price of this since first thing this morning making it one of the better deals today.
Remember to reduce the warranty to minimum and buy via Quidco for further cashback savings.
305-D10E05 - £439 delivered or less
Intel® Pentium® D 805 Dual Core Processor (2.66GHz, 533MHz fsb, 2x1MB cache)
Genuine Windows® XP Home Edition (Does not include Operating System Re-installation CD)
1024MB Dual Channel DDR2 533MHz [2x512] Memory
160GB (7200rpm) Serial ATA Hard Drive with 8MB DataBurst cache
16X DVD+/-RW Drive
256MB nVidia GeForce 7300 Turbocache graphics card
Dell 19" Value Flat Panel (E196FP)
Integrated Audio with Dolby Digital 7.1 capability
Microsoft® Works 8 - English