Playing favorites

I went through my bookshelves today and made a list of my favorite books.  It’s a little long.  I’m working on different ways of organizing them.  I ranked them, sort of.  I put them in three groups, anyway, based on how much I love them, but I didn’t rank within the groups.  I might group them by how long they’ve been my favorites.  Should newer books get a lower ranking because I haven’t read them a million times?  Should Anne McCaffrey books be ranked higher because I’ve loved them since i was 9 or 10?  And Anne of Green Gables?  And Pride and Prejudice?  Anyway, I’m obsessing a little over this, but it was a fun way to spend the couple of hours I was home before John got back from class.