Minimal full backups in Vista

>I would like to install Vista, then install about a dozen miscellaneous
>programs, customize some settings, make a few user accounts, and install
>some user data, and then:
> Make a complete system backup onto DVDs, wipe the hard drive, and then
> restore the system using those backup DVDs and the Vista RC1 DVD, in order
> to experience just how automated the process is.
> However, I _don't_ want to waste time and DVD(s) backing up all the Vista
> system files which I already have anyway on the RC1 DVD. So, what I want
> is a complete system backup _except_ for those system files (though I do
> want to backup any system files which have changed from their original RC1
> versions due to Windows updates), yet retain the ability to wipe the hard
> drive and do a complete system restore using the backup DVDs and the RC1
> DVD.
> How can I do this?
> If the answer is "You can't, because the full backup is block- rather than
> filesystem-level", then shouldn't the full backup be filesystem-level
> (besides the boot sector)?
> And if the answer is "If you exclude Vista's system files, then it's not a
> full backup", that's moot, because the Vista RC1 DVD, which contains those
> system files, is necessary anyway for bootstrapping the full restore
> process.
>