get a used Gateway GT-5432 w/o monitor.
AMD 5000+ processer
XP and Vista Drivers available on line
1 gig RAM
128 meg Video Graphic - built-in
AC_7 Audio - built-in
DVD Burner & Modem - built-in
comes with its own version of an OEM Back-up Disc.
last year they sold for $324.00 US .. with the release of the AMD 9800+
its price should really be low for that complete system ^__^