From Dell:
Dimension 9200 for £987 inc VAT and delivery:
PROCESSOR Intel® Viiv™ Core™ 2 Duo E6300 Processor (1.86GHz, 1066MHz, 2MB) edit
OPERATING SYSTEM Genuine Windows® XP Media Center Edition 2005 (Incl Operating System Re-installation CD) - English edit
VISTA UPGRADE MCE to Vista Premium Upgrade on:
www.dellvistaupgrade.productorder.com before 03/31/07 edit
SUPPORT SERVICES Collect & Return, 1 Year Service only edit
MONITOR Dell™ 20" UltraSharp™ Digital Flat Panel (2007FP) - UK/Irish edit
MEMORY 2048MB Dual Channel DDR2 533MHz [2x1024] Memory edit
HARD DRIVE 500GB Serial ATA RAID 0 Stripe [2x250GB 7200rpm drives with DataBurst™ cache] edit
OPTICAL DRIVE 16x DVD +/- RW Drive edit
GRAPHICS CARD 256MB nVidia® GeForce® 7900GS graphics card
I don't like RAID 0 however as if 1 hard drive goes you loose everything.
Or the
Dimension E520 for £764 (less memory and cheaper graphics card but same CPU)
Intel® Viiv™ Core™ 2 Duo E6300 Processor (1.86GHz, 1066MHz, 2MB) edit
OPERATING SYSTEM Genuine Windows® XP Media Center Edition 2005 (Incl Operating System Re-installation CD) - English edit
VISTA UPGRADE MCE to Vista Premium Upgrade on:
www.dellvistaupgrade.productorder.com before 03/31/07 edit
SUPPORT SERVICES Collect & Return, 1 Year Service only edit
MONITOR Dell™ 20" UltraSharp™ Digital Flat Panel (2007FP) - UK/Irish edit
MEMORY 1024MB Dual Channel DDR2 533MHz [2x512] Memory edit
HARD DRIVE 250GB (7200rpm) Serial ATA Hard Drive with 8MB DataBurst™ cache edit
OPTICAL DRIVE 16x DVD +/- RW Drive edit
GRAPHICS CARD 256MB nVidia® GeForce® 7300 Turbocache graphics card
Both these have the 20" monitor giving 1600 x 1200 resolution which makes multi tabling easier.