Captain Atom, Voodoo, Fury of Firestorm, Savage Hawkman, Grifter, DC Universe Presents (or perhaps Blue Beetle or Legion Lost in substitution for one of these). These are the books that currently have the most evidence for qualifying for cancellation. Reviews and personal opinions aside, Catwoman, Red Lanterns and Batman: The Dark Knight have too strong of sales to merit cancellation at this point. Also, Dark Knight is getting a change in writers coming up, switching to the author of the recent Penguin miniseries which, given the expectations for it, was incredibly well received. I'd beg people to give Dark Knight another chance when his time starts... it'll be like a new title starting at that point. The series that I selected were those consistently showing the lowest rankings on chart in tandem with the largest portion of their starting readership having be shed. I factored in the current 'rate of decay' which suggests that those one will be the first to cross the typical cancellation threshold. At this point, the only two series that are at or below that line are Captain Atom and Voodoo (and that is with the excluded returnables included... given the numbers and anecdotal evidence in context with the returnability context, not many retailers can apply returnability at this time).