I'll say go with Phenom. Utilized or not, you have up to 3 cores for future uses... plus from what I've read, you'd need a more expensive setup to take advantage of AMD top dual-core stuffs... (oh bummer!) sincerely, I'd even recommend him switching to Intel to avoid the hassles.
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cChip interpreter WIP - current status: Release Candidate
LRx Filter RC - current performance rating: 9/10