I'd gladly buy the following Omnibi

Thor - Simonson
FF - Byrne
Spider-Man - Stern/JR
Iron-Man - Micheline/Layton/JR
Silver Surfer/Thanos/Infinity whatever mumbo-jumbo - Starlin/Lim
Conan - Thomas/Smith/Buscema/various
Iron Fist - if it isn't masterworked

Unfortunately, this list never seems to change year after year.