We use the DELL Repository Manager to create our own SUU Updates disks. With it you can specify what you want written to the SUU ISO, either platform or component specific. That way you will be able to create a CD for just your HW Platform and just the Components selected.
In the past we have had issues with some DUPs released by DELL... In those cases we needed to select an older variant of the Bundles to get DUPs that would work until DELL sorted the mess out...