[whpalmer4]

Again, I'm a bit puzzled as to why you think you can't track a large project in OmniFocus. If you want to be able to manage each sub-project with all of the project management tools, make a folder to contain all of the pieces, and make the sub-projects into projects in that folder.

Perhaps if you outlined the specific obstacles you see to managing a large project in OmniFocus (and your idea of the scale a project needs to be large) we could find some solutions...