How to delete ALL accounts in preparation to sell computer?

I'm selling a Mac (five of 'em actually), and after doing a fresh OS (Tiger v10.4.3) install, followed by all system and app updates, I now want to delete all user accounts and traces thereof -- after I have cash in hand, of course. This so the Apple Setup Assistant starts on boot, and the buyer gets a fresh machine, including the lovely "Welcome to Apple" video/music extravaganza.
I know I've read instructions for doing this somewhere, but can now find no trace of them. Any help would be appreciated.
iMac iSight 20" Mac OS X (10.4.3)

From a note at MacOSXHints on how to "Make OS X re-run the initial setup assistant":
1.Boot into single-user mode (command-S during startup)
2. Once the command-line prompt appears, type the following:
mount -uw /
cd /private/var/db/netinfo
mv local.nidb local.old
rm ../.AppleSetupDone
exit
When you hit RETURN after typing exit, OS X will restart and the setup assistant will launch automatically. So if you've somehow messed up your primary OS X user, this is a good fix that may get you up and running again, even if re-running the OS X installer does not.
Using that as a basis, then in your case, since you've installed the OS, you should only have one user, boot each machine with a bootable external FWHD (or mount each to a good machine in TDM), launch the Terminal app, and then do these commands:
sudo cd /Volumes/<machine's name>/private/var/db/netinfo/
sudo mv local.nidb local.nidb.old
sudo cd /Volumes/<machine's name>/
sudo rm -R /Users/<username>
sudo rm ../.AppleSetupDone
G4 450 MP Gigabit Mac OS X (10.4.3)

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