EDIT: ctime is not what you want either (I knew that). I don't think you can actually do what you want with the "find" command. There is no separate entry for "creation" time. See man pages for "stat" and "fstat". Modifying a file is basically the same as creating a new one (which actually is often the case anyway when using apps like vi).
Yeah, I already have come to the conclusiong that you would have to create an app that monitors your entire filesystem and logs a seperate entry for initial creation to accomplish this. But as you said these results would also be invalid when it come to apps like vi that create new files when an existing file is modified.