Hmm, I don't know. Wouldn't it be worth having full specs for completeness? Also, some sites miss certain details. For example, most list the Apple specified max amount of RAM, but sometimes a machine can support more than that -- useful information. I think going for completeness should be a goal. I'd also like to see model numbers, part numbers, etc included.
As for layout, either has it's benefits, but I'm guessing a list would be a bit more logical.
ChristTrekker wrote:This conversation could rightly move to the talk page for the specifications template.
IMHO it would be better to keep as much of the conversation on the forums as possible, at least until we get the basic structure outlined. But if you want to use the talk pages then feel free.