If u are Graphic Designer then u need a simple P4 or AMD athlon
and If you are using 3dmax,Maya,cinema 4d then u should Go for INTEL HT technology or Amd 64 Bit
System specification :-
INTEL 3.2 HT Processor
Motherboard... any which is supported AGP 8x Technology
Ram 1GB
HDD 200 GB
Graphic Card : Geforce FX 5950 or ATI Radeon X800
And offcourse Dvd Writer
This system is really good for your Graphics and 3d Work
Good Luck