You want the re-spins from fedora unity. They are availale for bittorrenting at http://torrent.fedoraunity.org
Every month, they release one with the latest updates.
EDIT: Sorry, I didn't see your note on 3rd party packages. After you torrent the isos, you should mount them as a disk. In there, there should be an RPM folder full of the packages; you should add you 3rd party packages there. You may also need to alter other files to get it recognized my anaconda.