I read somewhere that you could overclock the piss out of the Pentium D's...like ~4.5+ GHz. Can you do that with the other one?
e2220 is a better choice, in the long run, it will last longer, it will keep its "moderness", & its two cores. It is also cooler. Look, if you are buying a processor then you might as well get an e7500 for super super cheap. its 2.93ghz c2d & makes a ton of difference. Take it into account, for the future.