Go straight to to top. You'll appreciate the 1.4.2 is far faster than the the Dual 1 Gig now discontinued model. The extra speed along with the extra features are worth it. Think of it as an investment. Or wait for another six months or so and see the next massive price drop. Whatever your purchase, I reccomend buying online at Apple Store and getting the full RAM Quota to avoid needless problems with the multitude of RAM heretics selling PC2700 garbage RAM. At least from the Apple Store they are bound to better service and genuine Apple Certified RAM and any problems will be sorted more properly. I don't trust any Computer Shops anymore be PC or Mac with lazy salesmen and too casual hardware support with no attention paid to ESD precautions. I wish middlemen could be removed from the quotient of purchasing and one could buy every thing direct from whoever manufactures, whatever it is. Sorry to rant but having been burnt a few times I am now extremely cautious now and probably a little too cynical. Paul