I finally gave in and bought an off the shelf base unit...it's HP pavillion a6455
OS Name Microsoft® Windows Vista™ Home Premium
Version 6.0.6000 Build 6000
Other OS Description Not Available
OS Manufacturer Microsoft Corporation
System Name 65-PC
System Manufacturer HP-Pavilion
System Model KP310AA-ABU a6455.uk
System Type X86-based PC
Processor AMD Phenom(tm) 9500 Quad-Core Processor, 2200 Mhz, 4 Core(s), 4 Logical Processor(s)
BIOS Version/Date Phoenix Technologies, LTD 5.13, 02/05/2008
Is it my imagination or is my ahem 'custom built' amd Athlone 64 nippier?
Maybe it's Vista? Couldn't get XP with it.