I don't think Dark Horse has announced yet if they are going to do the Marvel books in an omnibus yet, but I really hope so.
I'd shop around on ebay, I've seen complete sets of the Marvel run go for much lower than you listed.
Also, if you enjoy the Indy comics, check out Star Wars Tales #19. It has a story where Indiana Jones discovers the Millenium Falcon. It's a pretty cool story.