In My suggest:

AMD platform:

AMD Athlon XP 2000+ or 1700+ .13u oc up to 2200+
VIA KT-400 or Nvidia NForce2 Chipset Mainboard
512 MB RAM or 256MB * 2
VGA:
Pure workstation VGA card: Leadtek Quodra4 380XGL about NTD 7k~8k
Geforce2 Ti modify to Quadro series
Geforce3 Ti modify to Quadro DCC
HDD: 80GB
TOTAL: Less than 25k NTD

Intel Platform:
Pentium IV 2.0AG
Intel E7205 Chipset (Dual Channel) about 8k~10k NTD
256MB * 2 RAM
VGA:
Geforce2 Ti modify to Quadro series
Geforce3 Ti modify to Quadro DCC
HDD: 80GB
Total: 25k +- 1k

Just for reference