It's reasonable to expect that the 2.93GHz would probably sell for more than the 2.66GHz, all other specs being equal. The question is, how much more? Certainly not $300 more, 2 years from now. Maybe $10 or $50 or possibly $100 more (although, I doubt anywhere near that much.) So your $300 "investment" will likely be worth something like $50 or less when it's time to sell. Unless you need maximum processor speed for your day-to-day use, as others have said, it's not worth it. For performance, the average user will notice a bigger bump from increased RAM or a faster HDD.