For 1500 dollars.....Lets see.......
processer-amd athlon 64 3200+
mobo-dfi nf4 ultra
memory-OCZ or G.Skill RAM
video card-eVga 6800GT
PSU-Antec Neopower 480
Sound Card-audigy 2 zs
disk drive-NEC cd-rw/dvd-rw
Hard drive-2 80 gig western digital drives in raid 0
case- Anything you want really, if you want looks and performance get either thermaltake or aspire, i personally have an x-navigator.
You can get the above and more for under 1500 bucks. Maybe even upgrade to raptor hard drives and a faster AMD processer.