mechBgon: Excellent! For those who are unaware...
FUD - Fear, Uncertainty and Doubt. ie [that means, "as in"]: lies, misinformation and propaganda
Peter & nan0bug: Yeah, with a $500 budget one can certainly build a better than merely decent PC. It all depends upon whether or not you are reusing old parts and peripherals really. If you don't need a new OS, monitor, scanner, printer or whatnot, then everything you spend can go into the CPU box. I do recommend getting a new optical mouse and keyboard ($15-30) , both wireless if that can be had within budget ($40-65). Let's see... A motherboard ($55-100) with built-in LAN, audio and video (with available AGP slot, possibly even TV-Out)... If the client is on a dialup, they'll need a PCI modem ($10-20), otherwise skip it... Minimum 256 MB DDR RAM ($30-$35)... 80GB Hard Drive ($80), DVD/CD-RW Combo Drive ($70) and Floppy ($10) or Multimedia Reader ($25-40)... Processor ($45-90), Fan/Cooler ($7-25) and Case ($45-75)... Then just add some speakers ($30-55) and you're done! When you balance what the PC will be used for it becomes clear which points you should splurge on and which you can afford to be more frugal.
HUN-YA!
Red Ronin