Just wondering/curious how Apple fulfills built to order via their online store. Is it like a cook in a restaurant with an order to make, like from scratch, for example grab the correct size HDD and screw it in to a Mac with the correct processor. I read a long time ago the Dell does exactly that, building a computer from the bottom up. Or, does the online store simply have large inventory of various configurations because they can, and then simply sends a Mac perhaps with a tweak here and there (Num keyboard versus small keyboard). I wonder if the standard configuration has been tested by Apple to be the best overall for durability, heat, and performance. For example, it's only $50 extra to get a 7200 rpm HDD on the MBPs and I would think it would be simpler and cheaper for Apple to only offer 7200 rpm HDD, especially on their 15s and 17s. Instead Apple has the 5400 as standard because less could go wrong, but if consumers wanted better performance they allow them to risk it by offering a 7200 option.