i3 2100 is actually 2 cores with hyper threading. You can overclock the black edition, but not the i3. Which if you do then AMD is the better choice. If you dont then go for the cheap one. Either one is good, this case, AMD.
Thanks for the suggestion, what do you think of this setup..
AMD Phenom II X4 955 Black Edition or Intel Core i3 2100
Asus M4A87TD USB3
4GB DDR3 1333mhz (2x 2GB)
Nvidia GeForcre GT220 (i don't need a very powerful GPU as i'm not going to be playing graphic intensive games).
500GB S-ATAII 3.0Gb/s