I'm going through my collection to see what hasn't been added. There's:
League of Extraordinary Gentlemen (she's into literature, so she may like this - at least the first one, anyway; the second may be a bit too violent for her)
V for Vendetta
Planetary (again, quite a few literary references)
Squadron Supreme (I don't think the fact that they're analogues to the JLA makes the book inaccessible, though the history of the characters prior to this story might)
Superman: Whatever Happened to the Man of Tomorrow?
G.I. Joe (the 80's Marvel series, specifically)
John Byrnes' Next Men (it might be hard to find the trades for this series, though)
Animal Man (might be too inaccessible, though)
The 9/11 tribute books (the two volume one by Dark Horse and DC, and the one by Alternative Comics)
