One thing I avidly collect is annotated copies of my favorite novels. From the mid-1980's till 1992 the Holy Grail for me book-wise was a copy of Leonard Wolf's 1976-ish large format The Annotated Dracula, 
which combined a facsimile reproduction of the original 1897 edition of Bram Stoker's work with extensive illustrations and annotations, and some supremely creepy artwork by Satty. I had seen copies in the libraries in ETSU and UT-Austin, but could never find one in a bookstore. After finding a dust-jacketed copy in Asheville, NC in 1992, oddly enough I never actually read the thing. In large part this was because not long afterwards I found an updated version of Wolf's annotated version called The Essential Dracula 
released in the early 1990's which, although a softcover and illustrated by Christopher Bing, with no facsimile or extensive drawings and photos, had updated annotations. Problem was that the font was so miniscule I really doubted I could read it. Problem was solved when I got the Desert Island Books annotated version Dracula Unearthed 
by Clive Leatherdale a few years back. Font was big enough to read and the annotations were superb.
Then a few months ago I found a newer hardback version of Essential. 
I got it and reread the novel over the past few weeks and really enjoyed it. The annotations were, frankly, so-so, although they didn't beat you over the head with the sexual symbolism of the novel (my recollection was that Leatherdale did). The footnotes were awfully small, and the footnote numbers virtually illegible, but I figured them out eventually.
I still think the original 1976 version is by far the best - it has the original type, in a tea-stained colored paper, with the margins full of photos and maps and creepy illustrations, to say nothing of the annotations.
I may go back and reread it now, now that I know I'm not missing anything in the annotations. On the other hand, though, I really did like Leatherdale's version. And I do still need to watch the Coppola film with the commentaries now that the Blu-Ray version has them...