I've got 2 standard PC's here, the basic one:

Celeron ~ 2GHz
256mb
20-40Gb
logitech ball-mice
CD-rom

The other one's a P4 with a faster HD and a better gfx card (basic one's got a mobo with everything built-in - Gigabyte).

Both is standard PC's from a manufacturer that makes PC's with standard PC components. That's the most important thing for me - to be able to fix spair parts fast etc. I buy our standard PC's with WinXP Pro OEM for about ~ €/$ 350.
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The tart is out there