Hi, I'm considering to buy a desktop PC but still confused with which CPU to choose. The one with AMD Athlon 64 +3700 2.2GHz is 380$, while the one with Intel PD DualCore 2.66 GHz costs 440$. I want my computer to be fast to run many software programs. Are the two much different in speed? I am pretty tight on budget so... I would really appreciate anyone's help. Thank you.