Meatwad... Dual core? Or Core-Duo?
Big difference.
Dual Core (Pentium-D) is basically two cores of old design.
Core-Duo is a brand new design, latest technology chip. It runs cooler and more efficiently, uses less power, and is much more stable. A 2.0GHZ Core-Duo runs MUCH faster than a 3.0GHZ Pentium-D.
"Hyperthreading" processors in my opinion are more hype than anything else. Dual core is going to be better in almost every scenario, unless you have an operating system that doesn't support multiple cores (Such as Windows 95/98/ME), or never run any software that supports multiple cores (AH DOES).