is that in $US?
Radeon 9600's
AMD Athlon 64 3000
MSI K8T Neo
burner
dvd drive
monitor: you might find a good deal on a 21" at a swap-meet, ive seen a 21" Sony Trinitron (they had it working) for $400 ($aus)
OS: whatever you prefer
HDD 120GB Seagate SATA 8MB
if you want a good case, you might want to look at a Thermaltake Lanfire case (if you have a big wallet) which has good, and silent cooling.