Use the SEARCH function for this Forum. There were several posts with links that compared the power of the latest INTEL DUEO-CORE and QUAD-CORE processors.
i second tomshardware.com there you will get detailed comparisons with benchmark results charted etc.... not some know-it-alls opinion on what is best. - mnx
The new stuff is benching very well and getting good reviews. If you want a high performer without stretching the budget, couldn't go wrong with Q6600, or any E8xxx, or Q9xxx.