The Blu-Ray + 3CD combo was too expensive, since it would've cost me $15 extra, so I got the regular Blu-Ray version, and for an audio version, I actually went with the HD Tracks version, which still ended up being cheaper overall for me than the BR3CD version.
In any case, the HD Tracks version is awesome, so I'd recommend that, but I can't comment on the iTunes version since I haven't heard it.