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i7 Extreme is the top performer under single CPU solutions. Unfortunately it also has a bad price/performance ratio. The i7-940 has a much better p/p ratio. Alienware is good but pricey. Your best bet is to compose a good system with good components and either build it yourself or have a friend do it for you. It is not difficult.
do you think a pc with (1) i7 @ 3.2ghz would be faster than a pc with (2) quad core @ 3.2ghz each?
Probably not. But it's actually cheaper to buy two Core i7 940s than two QX9770s. And two i7s will perform significantly better, offering up to 16 threads - and for less money!
Robert, look at http://www.adobeforums.com/webx/.59b70da3/0
Unfortunately, the chips and motherboards to use two i7's will not be available until that nebulous "first quarter 2009"
Here is one preliminary benchmark: "Early tests conducted with Intel's upcoming Nehalem-based Xeons by TechRadar today show the processor running approximately twice as fast as its current equivalent. Based on the same basic design as Core i7 mainstream chips, a pair of 2.8GHz quad-core Xeon X5560 chips received a SPEC score of 160 in floating-point math tests versus 90 for two 3.4GHz Xeons from the current generation."