I'd have to agree with the call to move to dual core. Specially for your multimedia/graphics needs. Like the last poster said, any programs that are multithreaded will spawn processes on both, and then there is the extra speed you'll get when running multiple programs at the same time.
This is the way of the future, the only reason to wait would be cost, which is always the case with technology. Yeah stuff next year will be a fraction of the cost, but next year something better/faster will be available for you to drool at.
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