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I think Macs are great and I don't necessarily need convincing that involces relatively speculative analysis of resale value. The problem is that, as a graduate student who needs a pretty good notebook computer, it remains much cheapter for me to go with a Dell up fraont. Even if a MacBook Pro (which is not available in the 12 or 13 inch size I want) will sell for more eventually, the money I have available NOW is the real issue. Grad school doesn't pay well.
Also: The "slightly slower processor" and the "much smaller hard drive" are significant differences.
The question becomes: who are you talking to? Giving blanket advice is of questionable value.