I used to have a PowerBook 165 years ago, so I guess it's a personal, nostalgic sort of thing. The "really wanted" status isn't typically based on how much money they're worth on my list. I put that label on any that I think would add the most diversity to the collection, and also some of the more rare models.

The Centris 660AV also is on there for personal nostalgic reasons even though I have 7 6100s which look nearly identical. Specifically I would want the Centris with auto-inject floppy.