just go to your local computer store and ask them to build a good system for you.
Ask them for the following configuration:
Intel P4 3.2 extreme(3.4extreme is out, i;m sure they'll use it in in mach4.0

) (800MHZ bus) CPU
Asus or intel motherboard on either 865 or 875 intel chipset.
Get 2 sticks of ddr400 ram(this way the dual channel mode will be activated and your puter will run faster)
S-ATA Hard drive (any size you want)
ATI Radeon 9800 video card
and thats fucking it.
This system will be as fast as that 8k system and you'll only spend like 1500-2500$ on it
