This is a very intelligent comparison and I think you're all making a mistake dismissing it ... if you think of the VW family ... VW/Audi/Porsche ... it makes complete sense.
The iMac is the Beetle (and don't roll your eyes until you drive the Beetle turbo.)
The iBook is the Jetta.
The t-book is the Audi TT.
The quicksilver SHOULD be a Porsche 911, but I think it needs some work.