I emailed my Omnibus ballot this morning. Besides the usual choices like Incredible Hulk by PAD, Rom, Conan, etc I also voted for Spectacular Spider-Man by Peter David. That's a nice run that has never gotten much attention, aside from the Death of Jean Dewolff arc, for whatever reason. It would be nice to have it all in one volume.
Also voted for a Thanos Classic Omnibus, which covers all his early appearances up thru the 1990 rebirth in Silver Surfer, the SS issues up thru Infinity Gauntlet then closing out with Infinity Gauntlet 1-6. Honestly, it would be pretty easy to pull this together. All (or most of) it has been reprinted the last several years, just scattered across various books.
Lastly, I voted for a Marvel Tales Omnibus (or you could call it Marvel Super-Heroes Omnibus) ... basically do what they did for Classic X-Men, just for Marvel's other long running classic reprint titles like Marvel Tales (Spidey reprints), Marvel's Greatest Comics (FF reprints), Marvel Super-Heroes (Hulk reprints), Marvel Super Action (Cap & Avengers reprints). Ideally the Omnibus would include covers, new back up strips, new or retouched art pages, house ads, bonus content, etc. I would buy that in a heartbeat. I really dig that Classic X-Men Omnibus and it would be awesome to see other series get that same director's cut style treatment.