If you haven’t seen what is available in the CS6 Creative Cloud, you must check it out. Adobe says Creative Cloud is the Way to Create Anything, and I don’t think they are too far off. Try it for a month, on Adobe!
InDesign’s liquid layouts will let you create a poster, turn it into a postcard, change it into a brochure, and link all the text. Make a change to one; all will change.
If you can dream it up, Adobe has software to make it happen; and, if by chance they don’t have the features you want, let them know. Put in a features request. They really seem to listen.