iLounge pontificates the idea of the "best" time to buy an Apple product. With the constant flurry of rumors and announcements, when's the best time for you to buy a Mac or an iPod?
[T]he purchase of any Apple product can be made on a single question: does the product available today have the features that will satisfy me? If the answer is yes, buy it and enjoy it. If the answer is no, wait. But don't second-guess your decision or wait around for a replacement that may take years to arrive. If you buy soon after release, you'll have the longest opportunity to enjoy the features and performance before something else comes along and makes you envious.
Our take has always been similar. If you need something now, buy it now and get the 5-8 months of extra usage out of it. So what if Core 2 Duos are coming up soon? They're not twice as fast as current models. Go ahead and get it now. Unless of course you're not in a hurry, then you can go ahead and wait.