By spooks
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the duo core 2 should be released in the spring. It would make much more sense to wait until it is released with Vista unless you desperately need a computer now.
AMD FX 64
I'd have to say the XEON dual-core or Opteron dual-core. But, for most of us it must be the Pentium D or AMD X2. For the money, I'd say AMD.
I would not waste any time on celerons or semprons. They are fine for business apps though.
intel core 2 duo
least power usage and very fast