how about:
an amd cpu, preferrably an amd athlon 64 7750 black edition cpu.
I'd go with a graphics card, not intergrated gfx, a budget gpu such as a radeon hd 4670 or a geforce 9500 gt, ram i recommend 2-3gb @800mhz, motherboard - something like a Gigabyte GA-MA770-UD3. PSU about 400w, HDD at like 250gb or even 320gb and the rest is your choice