In fact I'd really like to see an omnibus of COIE with all of the tie-ins. We've never had a standard HC edition of that, just the deluxe HC and the Absolute. I'm not sure if Final Crisis would benefit from an omnibus having never read any of the tie-ins apart from the Morrison Batman stuff, but I definitely think that it's about time for a Flashpoint one - surely there's enough Flashpoint minis to fill an omnibus, and they could also include the Road to Flashpoint from the Flash series and the last few pages of Time Masters: Vanishing Point.