Processor: AMD Athlon 64 X2 4800+ 2000MHz HT Socket 939 Dual Core Processor - $632
Mobo:ASUS A8N-SLI Premium ATX AMD Motherboard - $160
RAM: CORSAIR 2GB (2 x 1GB) DDR400 PC3200 - $200
Graphics Card: eVGA Geforce 7900GTX 512MB - $480
Sound Card: Creative Sound Blaster X-Fi XtremeMusic Sound Card - $91
Drives:
C: Western Digital Raptor X 150GB 10K RPM 3.5" Serial ATA150 Hard Drive - $334
D: Western Digital Caviar SE 250GB 3.5" SATA 3.0Gb/s Hard Drive - $83
E: NEC 16X DVD±R DVD Burner Black IDE/ATAPI Model - $36
PSU: Antec TRUEPOWERII TPII-550 550W Power Supply - $80
Case:any of these will be fine... (i'll say $70)
Approx: $2166
get that and build it yourself and order from newegg.com (cheapest place)
btw, there's no such thing as AMD 3800FX chip