Is that the set I have, or a different set?
This is a great topic.
My level of fussiness varies depending on much I love the book or author. Like BookJumper, I spent more on a certain set of paperback Coldfire books because of the artwork, and I'm very pleased with them.
I have other books from the same author or series in different styles and amn't bothered by it.
I like to go both ways with older books - I want a new edition with notes and information and I also want a very old copy as I collect old books.
Dorian Gray, arguably my favourite book - I have my college Norton edition which is ugly but informative, I have the leatherbound Penguin collectible which I recieved as a very thoughtful present, and I also have an illustrated hardback edition from 1925 which I'm afraid to open. I like to have a bit of everything - notes, aestethics and sheer class.