Well if you were to buy used off [H]ardForum:
All prices are rough estimates and include shipping fee.
7800GT: $230
Opteron CPU w/fan: $150
2GB Ram: $150
Nforce 4 mobo: $60
case:$50
psu: $50
300gb SATA HD: $100
16x DVD Burner: $30
decent 17" LCD $150
Audigy 2: $40
XP Pro: $75
$1085 for all that.. $935 w/o monitor.. little better than ok
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Asus A8N SLI - Opteron 148 @ 2.8 under a Zalman 7000cu LED - XFX 7800GT oc'd - 1gb Kingston Hyper X pc3000 BH5 2-2-2 - OCZ ModStream 450watt - WD 36gb Raptor - WD 320gb Storage Drive - Antec Super LanBoy - NEC 3550A 16x DVD Burner
Accessories:
ViewSonic VA1912wb 19" 8ms Widescreen - Plantronics Audio 90 - Logitech Z-640 5.1 - Razer Diamondback Plasma LE on a Ratpadz GS
Linux Box:
Pending..