If u hav lotsa money then this wud help
CPU= Athlon 64 bit
RAM= 1GB+
Motherboard= The best that supports the given CPU
opt from MSI or ASUS
A good graphics is most important
256MB graphics memory is must now
Go for ATI X1900 from Gigabyte or ASUS
Or Geforce 7800XT from same
A 7200 rpm HDD with lotsa space atleast 80GB
or go for seagate chetaah

And to handle all this u need a gud cabinet 4m alienworld or antec
dats my dream PC too for now