I have also been to http://www.charismauk.co.uk and I got a:

Pent. III 1000Mhz
128Mb SD-RAM
20Gb H.Disk.
Samsung DVD-Rom
16Mb ATI Graphics Card
56K V.90 Fax Modem
Floppy + Speakers + Keyboard + Mouse + ATX case

(for my cousin) all for a mere £349 + Vat. It runs like a dream and the service has been very professional